Which one of these cheap game should I get? HELP!!!!!!

I need a cheap game under 20 bucks. I have all the big titles, so dont recommend Bioshock, COD 4, Halo 3 etc. The games Im looking at are

1. Lost Planet
2. Far Cry Instincts Predator
3. GUN
4. Marvel Ultimate Alliance

Lost Planet is the only game I havent played, though I played just the demo, and didnt think it was all that great. Please dont recommend Dead Rising or FEAR, as I have both of those, but if you have some cheap, rare gems you might want to steer me towards, please post them. Thanks.

go with far cry none of those games are all that great but far cry is the best out of those

Ive personally been looking at Amped3, Kameo, Rayman and Oblivion

although i have Marvel (as it came with the system) and i think its a lot of fun, especially to play when you have friends over

GUN always interested me but i never got around to getting it for any system and I heard far cry was pretty good

Marvel Ultimate Alliance.

If you didnt like the demo for Lost Planet then you wont like the game, you do the exact same thing every level... run to the end and kill a boss (no need to kill any of the monsters in the way since the AI is way too stupid to kill you). The multiplayer is a lot of fun in Lost Planet, but no one plays anymore.

lost planet followed by fcip