Yes SMG is very innovative where SMS had no real innovation.. SMG also feels much more like the 2D mario games than any other 3D version
As for shooters, I'd wait until The Conduit unless you really need one, then I'd go for CoD: WaW although you probably already have this game.
Also a warning about Metroid, it's not your standard FPS, it has many adventure elements to it.
Resident Evil 4: Wii Edition is the definitive version of that game if you didn't have that for gamecube or PS2 then it's one to buy.
Mario Kart Wii is a great game too that you'd enjoy once you get used to the controls, great online.
Okami is much like Zelda and as you didn't like Zelda, I wouldn't recommend it
For a great third party game, I'd say go for Madworld, it comes out in March and looks like a really interesting game.
So I'd say buy:
1. Super Mario Galaxy
2. Metroid Prime 3: Corruption
3. Resident Evil 4: Wii Edition (If you didn't have it for GameCube or PS2)
4. Mario Kart Wii
5. Madworld
6. Super Smash Bros. Brawl (if you like local multiplayer - online is laggy)
and also buy Wii Play as it comes with a controller and is only $10 more than a remote on it's own :)
