Well, get the PS3, try it for a few months. If you don't like it - sell it on, and get a Wii.
If you were to get a Wii and not like that, you wouldn't be able to fall back on the PS3 without somekind of financial input from yourself. With the PS3, there's less of a risk.
As to killing off your 360: Stick it in the smallest space you can find, and bundle it in clothes. Turn your thermastat up to full and leave the console on contantly for about 4 days. That should do it.











