I couldn't stand sports games untill i got a Wii. The new controles really make sports games alot more enjoyable then just pressing a button to swing ect...
I used the SIAXSIS motion to play MLB 2K7 on PS3 once and hated it. I almost spilled my beer! Maybe I'm just old fashioned.
Right now if you are not going to be watching Blu Ray movies it makes sense to buy a 360 and wait for PS3's prices to come down. 360 has more games right now and is cheaper.
If you want a video game system that is a Blu Ray player that can store pics, video and music. Not to mention 'Home' coming later this year a very cool online community that will be light years ahead of XBox marketplace and FREE! I would say pony up the dough and "Play Beyond" Corny I know LOL