Buy both but i prefer L4d2 if you want to kick some zombie @ss and if you want terrorist @ss by Mw2 btw im buying mw2(on ps3) first then l4d2(probably PC)
l4d2 it has more zombies and its more funner.
yes
Yes, Download steam, make an account, search L4D2 and download the demo from there.
I have l4d, Not l4d2. But, there is no specific order. They're all different stories with the same people involved.
yes in verus
yes
yes
!buy
buy it
you can't
It depends on what you want to do with your PS3, if you are looking to be able to play PS2 games, then you get a PS3 Fat, but if you only want it for PS3-related usage, you should definitely go for a slim.