When do I push this?

[JMa]

10/20 6max at a for me new site. This is the first day ive seen villain around, he was at two of my tables. he hasnt been out of line yet and neither have I. he is TAGish and so am i. this is the second time he has 3-bet me preflop, the first time i folded and he CBetted out another player on the flop. We are $2.6k deep. on to the hand-

I raise to 70 UTG with J[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img], all fold to villain in BB who makes it $285. I call!

The flop comes K[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/heart.gif[/img]. He bets $490. I think about pushing but just call.

Turn is Q[img]/images/graemlins/spade.gif[/img]. Check, check.

River is 2[img]/images/graemlins/club.gif[/img]. He checks, I push. Its a slight overbet, about $1.8k in a $1500 pot.

Is this better than pushing flop or turn? just check river? as a side note, i really like to push. its the most powerful move in NLHE.