PS3 and probably a Revolution. It's all about the games. I still haven't seen an XBox exclusive title that interests me in the slightest. Nintendo is the best game maker out there and has a knack for releasing games that are simply fun, it's unfortunate their 3rd party support is so lack luster, though it is pretty much their fault.
I bought a PS2 the day it came out, and it still works fine, except for the controllers which are way too fragile. Luck of the draw. Now the PS1 on the otherhand, is there anyone who bought a first gen that didn't have hardware problems? Flipping the console upside was pretty much as famous as blowing into your NES to get it to work.