I'd pay $300, maybe $400 if they had as many good games as the 360 does now. So, maybe next year I'll buy one.
I will not pay $600 for a gaming machine. I can afford it, I just don't like throwing away my money like that. There is plenty on the 360 to keep me interested (in fact, over the next 8 months, I really prefer the 360 lineup) and maybe in 2008 or 2009, I'll spring for a cheaper PS3.
As it stands now, LittleBigPlanet is the only game that really interests me. Lair doesn't do it for me and I can play any number of games just like R:FOM on the 360, and quite a few of them look better.