10/20 Commerce Aces

1st hand post so bare with me:

7 handed in small blind with Aces
Villian who just sat down with about 4k in $25 chips (just came from a limit game-I have never seen him before) raises to 120 I cover

Good/tricky regular calls utg+1
folded to me I make it 400 to go (I make this bet as a steal often enough but villian is obviously unaware)
Villian thinks for a few seconds and calls
utg+1 folds

Flop(940): 73K suits don't matter
I check he bets 630 I call

turn: 73KK
I check villian checks

River(2200): 73KK7
I check villian bets $1000
Hero???

Comments on all would be appreciated