500gb Seagate internal.
Wanted a 1tb but knew it wouldn't fit without surgery (not to mention a very nice sale price on the Seagate ).
I have several 1tb and a couple 2tb externals sitting at my house. I will probably dedicate one of them for PS3 use when I get off the road trip I'm on.
Still a bit unsure if I want to hack up the PS3 (not a warranty or brick issue). I just like the idea of being able to swap drives "on a whim" if I want.
I would much rather go to my grave not needing my gun, than go there wishing I had it.