Really depends what kind of games your into mate!
I also really enjoyed resistance, and prefer MotorStorm online alot more (give that a try before letting it collect dust!)
If your after some decent sports games try Fight Night Round 3, NBA 2K7 or Virtual Tennis 3.
Fight Night is alot of fun and can be hard to master.. it's online modes are good and career is not over in ten minutes. It's also fun to play with your mates.
I've only played NBA2K7 round a friends but if your into basketball i'd say it's the way to go.. using the sixaxis for free throws is fun.
And Virtual Tennis 3 is one of those simple but enjoyable games, check out the PS store for a demo.
So far no other shooting game has matched resistance for me, I had alot of fun completeing F.E.A.R. but it was no match!
Also try getting into Resistance online.
I'm still trying to decide what my next game purchase will be
