I didn't own a PS2 until this year actually. I owned a PS3 before a PS2. (originally bought it to double as a cheap DVD player)
Also, the Gamecube has a ton of great games, and I completely feel that while the PS2 has more good games, the GC had more great games.
The Wii has some quality titles, like Muramasa the Demon Blade, Monster Hunter Tri, No More Heroes (to name a few) and games I can play with friends/family that don't game much... Wii party, Mario Sports Mix, Kirby. Plus games like Mario, Zelda, and Smash Bros.
but as an addage, just realize my PS2 collection will be growing, while my GC collection is pretty much done.
THE JACKEL