Definitely need this game for PS3, but can't justify paying for it right now when I've got 5 other games waiting to be played because my PS3 busted for the 3rd and final time. Time to buy a new one.
It's definitely not too buggy to play. I'm about 60 hours in and it's frozen temporarily and completely a few times. Once there was a glitch that prevented me from doing something. I would just advise you to save often. The thing is, the game is sooooo incredibly good that it doesn't even matter.
I just picked up Dead Space for PS3 for $20.90 on clearance at Target.
It wasn't in the typical clearance section that's usually behind the video game area. I found the PS3 clearance games on an aisle end cap by the DVDs.
I'm in the Chicago suburbs.