Well out of the sales list To get the most out of your money i would suggest resistance 2, It has co-op mode for the story which is always fun with friends, especially on the hard difficulty. Also it is constantly updated and the community is pretty nice. Multiplayer online is competitive and fun
You could get Prince of Persia for PC but it looks alot better if you have it for ps3 and playing it on an HD tv, if you have one. The game looks really vibrant and it's really fun climbing around, the combat is pretty fun as well.
Don't get uncharted 1. It will piss you off. The AI. is HORRIBLE...
I had uncharted 1 for like two days. it was great, it felt great, it looked great till i started to see some problems when it came to the AI.
The game breaks the illusion of play with it's event triggered encounters. I tried playing around to see if the enemies come out if you shoot at them, but it seems that they don't. I shot grenades and my AK at the area where they are supposed to be but nothing happened. soon after taking 5 steps in, it sounded like 4th of july with returning gunfire. It makes sneaking hard and nearly impossible as the enemy AI knows EXACTLY where you are. You can be hiding somewhere but they will all focus fire at your point. Now I'm not sure if they fixed this in uncharted 2, but these problems make me sell uncharted 1 back to the retailer. Don't get me wrong the game is great if you're into shooters, but at some points you will be pinned down in one spot shooting down natives to the point where it feels like a shooting gallery.
Don't get Lair:
Lair is cheap for a reason, it's bad. The game is focused on using the motion controls of the ps3 controller which is unresponsive to say the least. All I need to say is, right after the release of lair, the dev company shut down.