I'm partial to the 360, but it's really a personal preference. I don't like the ps2/3 controllers at all, but if you already have a ps2 then that won't bother you. Other than that it really boils down to a few questions.
1. Do you need to be able to play blu-rays?
2. Do you want to do online gaming?
The PlayStation 3 costs more, but you also get more (blu-ray player, free online, built-in hard drive). The basic ps3 costs $300 and has a 160gb hard drive (or $350 for one with a 320gb hard drive).
For comparable specs in a 360 (250gb hard drive, but NO blu-ray player), it'll cost $300, and then you also have to pay $50 - $60 per year if you want Xbox Live. So you end up paying more for less. There is also a 4gb Xbox for $200, which might be enough for you. You might need an additional hard drive to play online, but I'm not sure. If you have enough technical knowledge you can also put just a regular 2.5" SATA hard drive in the 360.
I don't have any experience with either the PS3 Move or the 360 Kinect, so I'll leave it to others to comment on that. I have a Wii so I don't really plan on checking the Kinect out until I hear overwhelmingly good things about it and the price comes down, neither of which I see happening anytime soon.
Having said that, I still prefer the 360. I can't get past the playstation controllers, and IMO the 360 has some pretty sweet exclusive games (never really played ps3's exclusive games). As far as sports games go, they both have pretty much the same games.