Iv only got the PS3 mate but spent the last year livin in a house with 2x psp's 2x Xbox's 1x 360 1x PS3 1x PS2 and a Wii

& we played the PS3 the most!
My mate I lived with loves Xbox (hes a first person fan!) But hes now getin a PS3 aswell. If you play online a lot the 360 is better right now, but next year? More and more people I know are geting PS3's now the price has come down so there will be more people to play online soon & the games are geting better as they learn how to program for PS3.
So if You can buy both

if not id get a PS3 its a good blueray player aswell to go with your nice new LCD!