Congrats, dude! Once you're done with NSMBW, Metroid Prime Trilogy and Excite Truck, I highly recommend you to buy (At least some of) the following games:
Okami
Super Mario Galaxy (I know, you already said you had played it a lot, but I just couldn't resist! 
)
Madworld
Rabbids Go Home
Legend of Zelda: Twilight Princess
Super Paper Mario
Mario Kart Wii
Punch-Out!!
Wario Land: Shake it!
The Beatles: Rock Band (If you like Music games, that's pretty much the best one available, imho...)
House of the Dead: Overkill
Super Smash Bros. Brawl
Muramasa: The Demon Blade
Wii Sports Resort (Seriously!)
Mario Strikers Charged
WIIWARE:
Contra ReBirth
Mega Man 9 (If you don't already have it on PSN...)
Mega Man 10 (See the above...)
World of Goo
And those are only the Wii games that I have played and enjoyed enough to recommend to anyone. There's surely many, many, many more Wii games that I haven't gotten my hands on that are awesome! You're in for one hell of a treat! 
