10/20NL 6max, Deep stacked. Decision time

[fuzzylogic]

No-Limit Hold'em, $20 BB (5 handed)

Hero ~($7700)
Villain ~($7400)

SB is a good tricky player (27/16 after~300 hands). I think he plays usually with higher stakes(25/50)

Preflop: Hero is on Button with 8[img]/images/graemlins/club.gif[/img]8[img]/images/graemlins/diamond.gif[/img]
UTG Folds, CO folds, Hero Raises (80$), Villain on SB raises(290$),BB Folds, I call (210$)

Flop: ($600) J[img]/images/graemlins/club.gif[/img]4[img]/images/graemlins/club.gif[/img]8[img]/images/graemlins/heart.gif[/img]
Villain bets (480$), Hero raises to (1440$), Villain calls (960$)

Turn: (3480$) A[img]/images/graemlins/diamond.gif[/img]
Villain bets (1720$). Pot is now 5200$, he has 4k$ left and I cover. Comments are welcome. Now what would you do here, and what do you think he has?

Thanks for your thoughts!

-FuzzyLogic