First Wave 360 Games

Now that the 360 has been out for a good while, what 360 games that I could get for aroumd 20 bucks should I get?First Wave 360 Games
CoD2, Condemned, PGR3, DOA4, Kameo (if you like plaformers, but get the others first), GRAW 1, Oblvion, FEAR. DOA and Kameo are the least of the bunch, but still fun. The others are AAA. Most are more than 20 new, but you can find them used for 20-25.