It depends on what you're looking for. I would say WAR is the best P2P MMORPG out there, but it has monthly fees and is pretty dead. Guild Wars is a good one, you can get 3 expansions for around 50 and there are no fees. TF2 would be my favorite FPS and with the orange box you can get it and 2 other great games cheap. If you like platformers I would say try LaTale and get CS if you like it.