You ought to check out part IV reaps, the DVD is dirt cheap now (£4.99 on Play.com) so it's in your price range
. I missed the last one at the cinema so I'm determined to watch the new one there. Problem is finding a babysitter to babysit for free, that's never easy.
I've kind of fallen behind with modern horror, apart from THEM and SAW IV, I'm struggling to think of one modern one I've seen since returning to England. I guess all that time without the old classics has taken me on a '70s and '80s classic horror kick.
Oh and I agree with you about SAW. In 20 years from now genre fans will be hailing it as a classic. I'm convinced of that.