Joe Matsuda said:
Scott Pilgrim Vs. The World: The Game!!!
...Limbo was pretty good too...
and I did have some good times with the Watchmen Ggames...
Scott Pilgrim the game is the only iteration if the character I like. The game is fantastic, especially if you played and enjoyed River City Ransom.
I found that it's actually cheaper to buy the Watchmen games on disc, I think Gamestop sells it with both games for $10.
Comic Jumper is fun for a bit but it gets really old fast (pretty much like their other games 'splosion man and the Maw).
Shadow Complex is a great game, but the 1200 pts. (standard for most games now) is a bit high but it's worth it.
Space Invaders Infinite Gene (or whatever it's called) is a fun game that begs for multiple playthroughs and only 800 pts.
Defense Grid is the best Tower Defense game I've ever played and is 800 pts.
Dead Rising 2: Case Zero is a nice prologue to the retail game (your level up to level 5 transfers over and the game is pretty long for a 400 pt. downloadable game/demo.
Greed COrps is a board game type strategy game that is based on gaining the opponents property and is 800 pts.
Jetpack Refueled is a remake of the 80's game Jetpack by Rare and also includes the original version and is 400 pts.
Panzer General (my favorite arcade game) is a mix of Magic the Gathering, Risk and Stratego and is 800 pts.
Hope some of those help you out and good luck deciding what games to get, that can be a challenge worthy of an achievement in and of itself sometimes.