Advice needed: 3 new games

So I thought I would take advantage of Gamestop's Buy 2 Get 1 Free sale for used games and wanted to solicit advice. In your opinion, what would be the 3 best games to get. These need to be used games, so Shadowrun, Forza, etc. don't count. I'm also trying to keep them under $40 each.

Here's the games I already own or have owned in the past: Gears of War, Saints Row, Crackdown, Tomb Raider: Legend, Oblivion, Viva Pinata, F.E.A.R., Madden 07, Splinter Cell: Double Agent, and Samurai Warriors: Empires.

I have rented, and am not interested in: Def Jam: Icon, Fight Night 3, and King Kong.

Currently, my top 3 are Dead Rising, Call of Duty 3, and Kameo.

Any suggestions?

kameo is like 20$ regular, so I wouldn't get that one,

R6 Vegas?

CoD2 perhaps?

dead rising
Cod2
cod3

i would advise against kameo. and replace it with rainbow six vegas,

Thanks for the good advice! Sounds like R6V is leading the pack, but I've never been into Clancy shooters (except Splinter Cell). However, I am downloading the demo as we speak and I'll give it a shot. I'm trying to get 3 games that are all different, so if I get R6V I won't get COD3 (or vice versa). What about LOTR:BFME2? I've never been a real-time strategy fan, but I am a LOTR fan.

Keep 'em coming!

BFME2 is good but its got severe framerate problems... if you're not a strategy fan then don't bother. Shame about the tech issues, the gameplay was fun :/ - but again, if you're not a strat fan, give it a skip.