You do realize that a Wii U can do almost everything a Wii can do, and more? Plus you get Wii U games out of the deal. You should just buy a Wii U.

Kinda does.  Here in Canada (I already own a Wii and a Wii U) I planned on buying Mario Kart Wii and a new controller.  I bought the Wii Mini that was bundled with Mario Kart Wii for $90.  That's how much the game and mote would have cost on their own, plus I got a nunchuk and a freakin console lol.  That  is a good deal.

Definitely check out Sonic Colours, that game is amazing.

This is a really bad deal dude.

Anyway the Wii has a shit ton of great 3rd party and Nintendo's games, Get Sin and Punishment, Red Steel 2, Silent HIll Memories, No More Heroes, The Trauma team series,Operation Rainfall titles, Fragile Dreams, Madworld, Muramasa,Okami. Gah I havent even scratched the surface

Time to go digging.

The two zelda games! Skyward Sword and Twilight Princess!

From my Wii game list, here's some suggestions:

Disc games

Dragon Ball Z: Budokai Tenkaichi 2
Dragon Ball Z: Budokai Tenkaichi 3
Excite Truck
Excitebots: Trick Racing
Trauma Center: Second Opinion
Trauma Center: New Blood
Trauma Team
The Godfather: Blackhand Edition
Bully: Scholarship Edition
Zack & Wiki: The Quest for Barbaros' Treasure
Link's Crossbow Training (packed in with Wii Zapper shell)
Battalion Wars 2 (BWii)
No More Heroes
No More Heroes 2: Desperate Struggle
Pinball Hall of Fame: The Williams Collection
Blast Works: Build Trade Destroy
Punch-Out!!
Madworld
Geon Cube
Metroid Prime Trilogy or Metroid Prime 3: Corruption if you can't find Trilogy
Metroid: Other M (yeah I said it!)
Red Steel
Red Steel 2
Wordjong Party
Mushroom Men: The Spore Wars
Sin & Punishment: Star Successor
GoldenEye 007 (that's Activision's version of course)
Ōkami
Resident Evil: The Umbrella Chronicles
Resident Evil 4: Wii Edition
The Legend of Zelda: Skyward Sword
The Legend of Zelda: Twilight Princess
Namco Museum Megamix
Big Brain Academy: Wii Degree
Mario Strikers Charged

WiiWare games

Mega Man 9
And Yet It Moves
Excitebike World Rally
Maboshi's Arcade

There are a LOT more games I could suggest for you to get but these are some of the ones I own that you might be interested in.
John Lucas

Sin & Punishment: Star successor

Xenoblade, Metroid Prime Trilogy (this can be hard to find/expensive; buying the three Prime games separately is a viable alternative).

GET THE WII U FOR YOUR OWN SAKE. If you are open to buy a Wii then the Wii U will be a paradise for you. Really, the Wii U has more value than what the Wii came out. Sales seem to not tell that, but believe me I love the Wii U far more than the Wii.

Silen hill SM, Red steel2, FF CC The crystal bearers, Arc rise Fantasia NFS Nitro, Excitebots, Elebits, NMH 2 on top of the already mentioned