For me it would be
Heathcliff: A younger Collin Farrell
Cathy: A younger Lindsay Lohan

Heathcliff - Arnold Schwarzenegger, when, rejected he goes off to make his fortune he could say "I'll be back"
Cathy - Madonna..
this would then be sooooooo bad the classic status of Olivier/Oberon would be immortal

I would have liked to have seen Gary Oldman and Winona Ryder in the 1992 version, for the up coming one I'll go with Joaquin Phoenix and Natalie Portman.

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Heathcliff : Jeff Hordley, he was BORN for the role!
Cathy: Emily Browning

Hey Dougie I know looks can be decieving but I swear I seen a light from you

Johnny Depp as Heathcliff, & Natalie Portman as Catherine Earnshaw.
Actually, a better idea would be to get kids to play both these characters(since they were both young. Catherine especially), & to get an actual Gypsy to play Heathcliff(since Heathcliff was a Gypsy orphan who was adopted by Earnshaw).

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There has been both grat and really insane suggestions and here's my thoughts on them:
HEATHCLIFF:
Joaquin Phoenix: Really good choice actually - I can totally see him playing the role.
Johnny Depp: He IS a great actor, but I don't think he looks the part (BUT if Keira would play Cathy he'd be a great choice - they have great chemistry!)
Gerard Butler: Probably a good choice, but I'm not convinced if he could play a truly passionate character..
Cilian Murphy: Looks waay too crazy, Heathcliff is supposed to be good-looking.
Johnathan Rhys-Meyers: I think he might be too young and looks too "polished" (but he'd might make a good Edgar).
Christian Bale: I kind of like the idea, but they would have to give him a "rough" makeover!
Orlando Bloom: Can not act.
CATHY:
Natalie Portman: I think she is the best choice. She's young, she's beautiful, she's a REALLY good actress!
Keira Knightley: She's goot a good look and she's British, but the acting skills are so-so.
Kate Winslet: Even though shes a great actress she's a bit too old and I don't think Cathy should have blonde hair.
Rachel Weitz: Kind of good, but too old
Rosamund Pike: Cathy? No. Isabella? Hell yeah.
Angelina Jolie: I actually cant imagine her in the role, but it's not the worst idea I've ever heard.
Lindsay Lohan: American, ugly and a TERRIBLE actress. A big no-no.
So I'd probably go with Joaquin Phoenix as Heathcliff and Natalie Portman as Cathy.
xoxo

I agree that Eva Green could pull off Cathy

How about Eva Green? People constantly mention the sort of mysterious-gothic look she has. i could picture her in a corset (without the scary eyeliner, though). and she has that sort of wiry fierceness to pull off cathy's wildness.
And Cillian Murphy - great at portraying raw, distraught characters, yet able to make them sympathetic and 3D. I think he'd be a great Heathcliff.
Eva Green and Cillian Murphy - i can totally see it!
Now, who would be a good Catherine (the second) and Hareton? (my personal favorite) A blonde actress able to alternate between spoiled and precocious, and a bulky, awkward-but-cuddly actor for Hareton..thing is, the trend for young actors today are the boyish, slender kind.
Abby Cornish for Isabella. And Sienna Miller, I know she's got a trashy rep, but the fact is, she was really good in THe Edge of Love and Casanova. I think she'd make a good Cathy the daughter. Ryan Phillipe, I think would make a good Edgar Linton. He has that delicate, aristocratic look to him, and he's played several roles portraying the contemporary New York upper-class elitist, so I suppose going back a few centuries wouldn't be too much of a stretch.
Either way, they need to cast actors who look like they're in their twenties. I hate it when they do the "oh, they were twenty in the book, but its okay if we have late-thirties-looking actors". I think this is a detail that is actually extremely important to the book - that the most pivotal plotlines revolved around the characters when they were in their late teens/early twenties.

I think i would like someone closer to the actual ages of Heathcliff and Cathy, and someone who's closer to Heathcliff's ethnicity. So I guess Reece Ritchie and Tamsin Egerton or Kaya Scodelario.

Natalie Portman is the new Cathy. No word on Heathcliff yet.

Either Gerard Butler or Joaquin Pheonix (What choices!) as Heathcliff and Claire Danes as Cathy. I have no idea why! i just think she'd be perfect!

Charlie Hunnam and Haley Atwell
"Kill my boss? Do I dare live out the American Dream?"
-The Simpsons (FOX)

Heath: If Heath Ledger was still alive. Johnny Depp of course.
Catherine: Emmy Rossum or Scarlett Johansson

Just a bit of history: Vivien Leigh was set to make 'That Hamilton Woman' and wasn't free to do WH. Yes, totally, she would have been great.
Actually I think Clive Owen would make a great Edgar. Otherwise:
Heathcliff - Gerard Butler or Karl Urban
Cathy - Kate Winslet
The characters are country people so wouldn't have necessarily been frail, fragile like Rhys-Meyers, etc. Regardless, I think that he and Cillian Murphy are too pretty for Heathcliff.

The only women who could have played Cathy was Elizabeth Taylor dark hair and firey eyes. As for Heath Cliff Daniel day Lewis or Marlon Brando because of there passion.

Heatchlif: Colin Firth (10 years younger)
Catherine: Jennifer Ehle OR Kate Blanchet

I haven't read the other posts, but I'm going to go with Jonathan Rhys Meyers and Anne Hathaway.
Life is pandemonium!

Catherine: Scarlett Johansson
Heathcliff: Clive Owen

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Heathcliff: Gerard Butler. He never occurred to me till I saw his name mentioned here and remembered him in 300I think
if
a remake was made it'd definitely have to be him in the role!
Cathy: I don't know who could possibly play her. I mean we have some great actresses but could they be Cathy?
I'm still not sure if I could really see anyone else playing Heathcliff and Cathy. I mean Laurence Olivier and Merle Oberon did so amazing and were so made for their parts. I don't think anyone could top them.
Cold Mountain~ Inman: "Icameback."

I agree with most saying Joaquin Phoenix or Gerry Butler as Heathcliff. I'd choose Winona Rider for Kathy. Someone before mentioned Julia Roberts or Nicole KidmanOMG they'd KILL one of my favorite movies! NOOOOOO!!!!! Maybe Maggie Smith could play the part of Ellen. As for Isabella, hhhmmmmaybe someone playful like Claire Danes? I'm not too familiar with the actors/actresses of the 90's, etc. Most of them just fade out after a couple of movies. If you're going to redo a classic then you've got to cast actors who are true actors and would make these roles a part of their soul.
"Love many
Trust few
Do wrong to none" Shakespeare & Yau-Man