Consoles and PC's fill different roles. I still play my xbox for racing/sports games, and use my PC for FPS/Strategy games. Although, the best thing about my xbox anymore is XBMC with all my music and video's. That shit is just awesome.
I will most likely get a 360, unless the PS3 ends up just blowing it away, but I am guessing they will end up being pretty equal with game performance, but with the media center extender for 360, it gets the edge for me.