I have seen most of the movies of on your list; I disagree with some of them while I agree with several of them and I have not seen a couple of those movies, namely Clay Pigeons, The Raven and Freeway. For me, Scream, I Know What You Did Last Summer and Urban Legend are not significant serial killer movies; they are merely slasher movies, and not terribly great ones at that (save for Scream perhaps, but even then I was never a fan of that movie). For what it is worth, here is my list of my top 15 serial killers movies, in no specific order:
1.The Silence of The Lambs
2.Seven
3.Henry Portrait of a Serial Killer
4.Zodiac
5.Chaser (2008)
6.Psycho
7.American Psycho
8.Wolf Creek
9.Natural Born Killers
10.Citizen X
11.Copycat
12.C'est Arriv Prs de Chez Vous (Man Bites Dog)
13.Behind the Mask: The Rise of Leslie Vernon
14.Angst (1983)
15.The Boston Strangler
Bill Foster: I'm the bad guy?How did that happen?

Citizen X-though "just" a tv film- is great.

So you have Scream and Urban Legend there, but no Zodiac and Natural Born killers? K.

No Manhunter???? Tut,tut

It's called Frailty, boyo

Alright cool. Althought I never heard of half those I might give them a try. However I was contacting you in hopes you knew the movie about a guy who suceeded his father in killing men who wore presumed to be demons/morally corrupt. It had a crazy twist endding. I forget the name.