I'd really like a PS3 for MGS4, DMC4, Heavenly Sword, and White Knight Story, but until I can crush coals into diamonds, I don't plan on getting one for awhile.
That and knowing Capcom and Konami, they're going to release special improved editions of MGS4 and DMC4 a year after the initial realese (just like what has happened with every MGS game and the Special Edition of DMC3), so rushing out to get a system to play these games just isn't something I am going to shed tears over. Plus I am sure there will be enough games still coming out on the PS2, GC, and for the still-fairly-new DS to keep me occupied. >.>
Same goes for Wii. Haven't seen enough on that system to warrant getting one. It looks kind of gimmicky. If I want to play a sport, I will go outside and play a sport, I dun need to play golf or tennis in my living room...