Uh...
Super Smash Bros. Brawl
Thats the only game I'd buy at release. If I magically had 250$ to spend on just Wii games I'd say...
Super Smash Bros. Brawl
Metroid Prime 3
Super Swing Golf 2
Super Paper Mario
Super Mario Galaxy
SSBB can't help but be awesome.
Metroid Prime 3 looks decent enough that I'd give it a try.
I love me some Super Swing Golf, so depending on what #2 adds I'd probably give that a shot.
Super Paper Mario I'm just giving the benefit of the doubt to since I enjoyed the other paper mario games, though I hear this one isn't like the RPG style of the others.
Super Mario Galaxy is a 3D Mario platformer, so again, benefit of the doubt that it'll be good. I really liked Super Mario Sunshine, so we'll see if its any better.
But yea, nothing that I can't wait on save Super Smash.