I already have:

Art Style Cubello
Word of Goo and
Bit. Trip Bit

Which one should I buy next?

Well if you liked Cubello, there's Art Style: Orbient and Art Style: Rotohex.

And if you're looking for a unique title, why not try Bonsai Barber or Tiki Towers?

Buy Mega Man 9.

I suggest Toki Tori.

Art Style: Rotohex is a lot of fun if you're into the Art Style stuff.

Go for Lostwinds. It has great music and graphics, the gameplays truly solid and the game as a whole is unique. And its all for 1000 Wii Points.

Or try out Bomberman Blast or Tetris Party are great too!

Megaman 9, Dr. Mario, Gradius Rebirth, Tetris Party (which I have yet to try...)

Tetris Party is the one I keep coming back to again and again...so many modes, you can even play it on the balance board!

Depends on what you're looking for. If you want puzzles that require actual thinking Toki Tori is a good pick (LostWinds is too damn easy to qualify as puzzles with thinking, the only difficulty is not getting lost due to no map and lacking directions). Mega Man 9 is IMO only worth it if you've already played all the available NES Mega Mans, it's weaker than the NES games and costs twice as much.

mmm I don't like mega man, maybe tetris party... I don't know

If you like puzzle games, Toki Tori and Bruiser and Scratch are both great games.

Onslaught, Cocoto: Platform Jumper, MegaMan 9, My Life as a King, and STRONG BAD!!!!

im in love with Bomberman Blast

but the Japanese are hard to beat online ( they had the game available early ?)

@MauWii: I gave up on Bomberman Blast months ago because of the endless waits trying to get an online game going, and the terrible lag when you did eventually manage it. Has the online experience improved recently?

Unfortunately the OP does not like Mega Man (Heresy! ), so I can only recommend Dr. Mario RX for WiiWare games.

>_> You can probably guess what the only 2 WiiWare games I have are.

Tetris Party is where it's at OP.

@Golgo, sometimes there's to wait for people to come in, indeed, ( i hate the small waiting bomb room.... )

but for the lag, like someone wrote, if it's a 5-6 players game i notice no lag at all ( sometimes even 7-8 players all fine )
(sometimes it's 7 Japanese vs me, am i scared ?)

• Bomerman Blast (Great for 8 player local play)
• Tetris Party (Great for 4 player local play if you have a big tv, pretty good online play)
• World of Goo (Great ~10 hour single player campaign, very hard to get flags "gold" on many of the levels, great music)
• Gradius Rebirth (Difficult but fun classic space shooter, later levels in loop 2 are practically impossible)

or save your points for:

• Bust-a-Move
• Driift
• Explodemon
• Supermeat Boy

@Pawtrick
OP has WoG. Great suggestions though. Still waiting for Bubble Bobble+!

Anyway, you're not going to get useful recommendations without saying what kinds of games you're looking for.