Saw... meh, probably keep it if you got money to burn, there's better movies you can get for £6.99. Fight Club?
http://www.play.com/DVD/DVD/4-/169121/F ... oduct.html
or a better 2 disc for £7.99?
http://www.play.com/DVD/DVD/4-/903901/F ... oduct.html
The Hole... bad, skip it
The Cell... erm, J'Lo?
I personally wouldn't buy those, certainly not the last two. The Hole is such a boring, boring film. 6.4 is a complete travesty. 3 or a 4 at most. I think i gave it a 2

I think your having a "horror" film rated by a mass audience, which is never smart. Demographics show women rated it higher. Maybe its because I ain't a chick?
Missing:
Ravenous -> Great film. Vastly underrated imo. No one ever hears about it but there's no sound reason for that, it just got swallowed up for some reason.
Ginger Snaps films -> first is best
Child's Play -> Don't fuck with the chuck. Why is this not on your list?
Carrie -> a good Stephen King. Some people find it a little dry, i thought it was a great Brian De Palma movie.
Modern Junk:
Dawn of the Dead Director's -> your buying a lot worse being the motivation.
From hell -> well my little brother liked it, i didn't think much of it at all, again your buying worse (the hole/the cell/etc.)