Well since nobody's going to argue with quigontcb, I'll go with a Nintendo 251.

Thanks everybody.

 A wise choice! Believe me, I really wish the official Nintendo 1k card worked great, but it's just not reliable enough, especially if it's your only card. I have about 80 GC games, so it's failure put a big hurt on me.

I got a 251 block Nintendo one. Anything under that is too small for a person with more than 10 games, but anything more will probably be more than you'll need

I had some third party hardware for my Gamecube, but decided to stick with official Nintendo stuff after one of my 3rd party controllers stopped working, and the memory card got corrupted for absolutely no reason.

I recently bought a Nintendo Gamecube, just to have in my video game collection.

I bought a used Gamecube and I will recommend this MadCatz GameCube Memory Card 64Mb.

No problems whatsoever with my games I have been playing.

I have a 1k one, and it randomly blanks all the memory. Since I only have like 2-3 games on it now (since it blanked itself after I got a Wii and don't play most of my GC games), a 251 block one would have been better.

GC got 2 slots. 2x 251 should be more than enough for all your games