Paulbot.. have you still not decided? Why not just get one now and then another later on... I usually end up with all the machines by the end of the generation.
I got a 360 instead of a PS3 for Street Fighter 4 earlier this year - based soley on price. Nothing to say i can't get a PS3 later on, and it'll be even cheaper when i decide to. It's not a bad way of doing it, since you can still find the popular games years later and unlike TFs, they're usually cheaper!