I did the same thing demonflair, I bought the following gamecube games.
Resident Evil 4
Super Mario Sunshine
Metroid Prime 2 (My brother has 1)
DK Jungle Beat (was really cheap so picked it up)
Donkey Konga 2 is in the mail right now
I really want Beyond Good and Evil, but the gamecube version is just so expensive.
My brother already owned the following:
Zelda Wind Waker
Super Smash Bro Melee
I first got mario sunshine, played through most of it, I have around 80/120 Shine sprites, very good game.
Next I played Resident Evil, I've played through about 4 hours, its really well done, but I'm bummed about the Wii version cause I want to get that instead, debating selling it and getting the wii version when it comes.
I played about 2 hours of Eternal Darkness, gonna get back to it, really cool, but haven't played enough to really give it a thumbs up or down.
Same story with viewtiful joe. I don't think I'd buy a sequal though.
Playing Metroid Prime 1 at the moment, brother borrowed Echoes. I'm gonna go ahead and say its my favorite of the games I bought so far. There is alot of reading when you scan stuff, but you don't have to read all of it, I do it just because I'm a perfectionist kind of. There may be a bit of backtracking, which while annoying is just a part of metroid, always has been. I'm about six hours in and it hasn't been too bad yet. The graphics are great, the story is suspenseful, all around I really like it and recommend getting the first at least. Get it and if you like it you can get the second. I plan on buying MP3 so I wanted to know the story of the first two before I bought the third.
I suggest ebay or www.hitgaming.com