LBP, although you might benefit more from waiting for LBP 2 to come out, I hear it's going to be a lot better than LBP. For me, they didn't quite nail LBP 1 so I'm looking forward to the sequel.
I don't have Uncharted, but I hear it's good so I would definitely consider buying that.
If you're into this kind of stuff, get GT5(Gran Turismo 5) I personally hate racing games, but my friend who is obsessed with them says it's the best racing game out there.
Then you could get some non-exclusives, I suggest CoD Black Ops, Just Cause 2, Red Dead Redemption, Assassin's Creed and obviously some of your non-exclusives favourites from when you had the Xbox.
Hope this helps.