PS3 Games Must Have (That Are Not New)

[skinsguy]

I'm wanting to expand my PS3 game collection, but I don't really have $50 to go out and buy the latest and greatest game (I usually buy the Madden game new every other year.) But, which games for the PS3 would you recommend getting that might be a couple years old or so? I only seem to be good at the shooter games that I can play on a PC (with a keyboard and mouse.) Here are the games I currently have:

1. Madden (8 & 10)
2. NHL 08
3. Guitar Hero Metallica
4. Guitar Hero Van Halen
5. Guitar Hero Areosmith
6. Tiger Woods 08'
7. Need For Speed (I can't remember which one right now)
8. Tekken
9. NCAA Football 10

Ones I am curious about are Grand Theft Auto IV, the wrestling game with the classic wrestlers, NCAA Basketball or any of the NBA games, whatever you guys suggest. I'm wanting something older that I don't have to pay full price for. Something I can pick up rather cheaply off of eBay, Amazon, or Half.com. Thanks in advance.