I only owned a GC. I don't give money to Microsoft. We run all our laptops and desktops without MS. It's not a dislike of the xbox. It's a dislike of the company.
The GC had the games that most appealed to me. Plus it can work out very expensive owning many consoles. My brother had a PS2 so when he got bored of that I borrowed it from him for Final Fantasy 12.
At the moment I have no next-gen consoles. I'm one of the few people in the UK that is waiting for some decent games to appear on the Wii. I've been very disappointed with the Wii lineup so far. The best Wii games to date (RE4 & Zelda) I own on the GC anyways. Metroid & Paper Mario have yet to appear over here. I guess I will get one next year when Mario Galaxy, Metroid, Mario Kart & Paper Mario have appeared. I also would need a TV at some point to play it.