In no particular order.
Suspiria-Still scary and effective
Deep Red-Possibly best all round film,great script and plot
Opera-Maybe the ultimate Argento film,has all his trademarks and often ramped up insanely
The Stendahl Syndrome-Most personal and very disturbing but at times oddly beautiful
The Cat O,Nine Tails-Most underrated,great suspense thriller,Argento mets Hitchcock!

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1. Suspiria
2. Deep Red
3. Opera
4. Tenebre
5. Trauma
   "Check out these people behind you, I'm totally convinced they're satanists!"

1. PHENOMENA
2. SUSPIRIA
3. TENEBREA
4. DEEP RED
5. STENDHAL SYNDROM

1. Tenebre
2. Suspiria
3. Deep Red
4. Sleepless
5. Opera

1)Deep Red-In my opinion his most coherent thriller.Or for better wording-Giallo.Great cast.dedicated to the late great David Hemmings.Argento's best lead.
5b4
2)Suspriria-Witches,Gory Murders,Awesome Soundtrack,and that color scheme.FREAKY.
3)Tenebrae-Another of his more coherent thrillers.Great bloody finale twist ending.
4)Opera-It all comes together for this one.Lots of style.Great murders.Creepy at times.Cool opera house setting.Love that soundtrack.You'll never look though a door peephole again after this.
5)Phenomena-Underatted in my book.Too many reveiws are of the butchered US version of when it was barely released by New Line back in 1985.This is a creepy,twisted, and very-gory concoction of Argentos greatest moments.Great cast too.

Pretty much off the top of my head

1. Deep Red
2. Tenebrae
3. Opera
4. Bird With The Crystal Plumage
5. Suspiria
   I wasn't sure which to go for, Suspiria or Inferno? In the end I went for Suspiria, because it's more fun. Also, I haven't seen his last two films yet but I look forward to them.

In no particular order:

1. Profondo Rosso
2. Tenebrae
3. Suspira
4. The Bird With The Crystal Plummage
5. Inferno
   I'd love to see Four Flies On Grey Velvet get a proper DVD release. I've seen it in French with Greek subs and it rocked. Maybe one day

1. Suspiria
2. Phenomena
3. Opera
4. Tenebre
5. The Bird With the Crystal Plumage
   The only copy of Deep Red I've seen is terribly hacked up (I need to find an uncut version to evaluate). Does Dawn of the Dead count? I think that's the best film Argento was ever involved with.

Suspiria
Phenomena
Inferno
Opera
another one
.
(` .. Jen ..)

1. Tenebrae
2. Suspiria
3. Deep Red
4. Terror at the Opera
5. The Bird With the Crystal Plumage

1. Deep Red
2. Tenebrae
3. The Bird With the Crystal Plumage
4. The Stendhal Syndrome
5. Suspiria

1. Suspiria
2. Deep Red
3. Tenebre
4. Opera
5. Inferno

1. Suspiria
2. Deep Red
3. Phenomena
4. Sleepless
5. Bird with the Crystal Plumage

Suspiria
Profondo Rosso
Inferno
Opera
Tenebrae
"Horror by definition is the emotion of pure revulsion..'-Dario Argento

1. Suspiria
2. Phenomena
3. Opera
4. Non Ho Sonno
5. Tenebre
6. Due Occhi Diabolici
7. Profondo Rosso
8. La Sindrome Di Stendhal

1. Profondo Rosso
2. Inferno
3. Suspiria
4. Phenomena
5. Il Gato A Nove Code
   My list would go on like this:
6. Opera
7. Tenebre
8. Trauma
   I haven't seen the rest of his filmography, but I'm on it. I can't wait to see Phantom of the Opera. I want to see with my eyes if it's really THAT horrible. I have that one and Two Evil Eyes on tape, I'll watch them soon. I'm from Spain. There are only a couple of Argento's movies released here. I'm watching his filmography thanks to my local library that has some of his movies which were released on vhs many years ago, and also thanks to e-mule. I'm downloading 4 flies, bird, stendhal syndrome, etc Plus, there is a cable channel in Spain, "canal 18", that often plays Argento's movies (Deep Red, Phenomena, Two Evil Eyes, Phantom, etc).
   Nada? Nada? Nada Da Da Da?!

1 Suspiria
2 Tenebrae
3 sleepless
4 bird with the crystal plumage
5 deep red
I have seen four flies on grey velvet, the film opens up in promising style but is generally slow moving and not Argento's best. Simular to 'bird with crystal plumage' I seem to remember but not as good. Just seen the card player, not made my mind up on that one yet.

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1 Opera
2 Phenomena
3 Suspiria
4 The Card Player
5 Tenebre

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1. Suspiria
2. Inferno
3. Opera
4. Bird W/the Crystal Plumage
5. Deep Red

Oprea
Deep Red
Phenomenon
The Bird With The Cyrstal Plumage
Tenabre
Also, his 'Masters Of Horror' episode

I haven't seen many but Suspiria is definetly the best one.