I'm going to spring for a wii, but only after the new Metroid Prime comes out. By then the price will be lower and I won't have to battle the heard to get my hands on one.
The wii graphics will be a good step up from the GC graphics for sure. I know that the 360 and ps3 have a lot more power under the hood but I don't care. If i was all about the graphics power and everything else, I wouldn't even consider a console anyway. The gpus in these new consoles were outdated before the developers even got a preview.
Considering Sonys long standing behavior pattern of treating their customers like cattle, I wouldn't touch the ps3 with a ten foot pole.
I won't have to worry about my wii downrezzing my signal to my tv because the tv didnt have some drm key. Early adoptors of hdtv sets are getting screwed by the content providers and player manufacturers with all this drm crap.
Since Nintendo is making new games that everybody is interested in, this means that I'll get yelled at less by my girlfriend when i pick up the controller, cause she will be playing too.