wait. the psp's are to dam fiddly, give microsoft a chance to hammer out the majour bugs in there system. anyway, good luck getting an xbox360 before christmass, and wait (if you want one) for the price on the psp to go down after christmass. its gone up by something like 100 euro since release
MS should have really fixed the 360's bugs b4 releasing it, surly they knew. That's why i would hold off for a bit and get a PsP in the mean time till the majority of the bugs are fixed then enjoy the 360 at its best.
Their completly different things. One is handheld and the other is a console. Depends if you want to play on the move or on your TV at home. To compare the two is pointless.