Rainbird, Wii owner. Wanna lend me some knowledge?

[Smeags]

Seeing as you have No More Heroes already on your list, I'm guessing that Desperate Struggle is unofficially on there as well.

Other than that... looking at your collection, here's what I suggest:

Dead Space - Dead Space Extraction (It's a great light gun shooter, if that's your thing. Also provides some back story into the DS universe)

LittleBigPlanet - New Super Mario Bros. Wii (It's 2D Mario goodness... I mean... that's reason enough right? )

MotorStorm - Mario Kart Wii (Frantic kart racing with great online support and 4 player local multiplayer. There's a reason why it's sold over 20 million)

Valkyria Chronicles - Fire Emblem: Radiant Dawn (if you enjoy SRPG's, you gotta try out Fire Emblem. It's gameplay mechanics are tried and true, and the characters themselves are fantastic)