The games you listed are all kind of ok in my mind...Burnout is cool but id personally recomend
Ridge Racer 6 - Great gameplay, good price and really REALLY adictive world tour mode. I've sunk over 25 hours in to the game.
Crackdown - Sandbox game that is what Merceneries 2 should have been, should be 20 bucks new
Dead Rising - must have for the 360, should be cheap to buy
And finally...
Too Human - I know, people may blast me for this. Its a game that has some issues and glitches. Also it takes a good hour to get going properly as for the first hour you are stuck with chunky controls and useless weapons. However, by the second level...if you've gotten 15 experience points or more and have given yourself proper skills...this game is amazing. Fighting the hordes of machines is hella fun if you have the proper weapons and powerups. Also it has a wicked story...and coop is amazing if you find someone to play with online. I have rockband 2 and merceneries 2 sitting collecting dust until i finish too human.
