What to do with this Overpair?

[LeVoodoo]

PokerRoom 10.1 with blinds at 15/30.

Hero: 1900 T[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/spade.gif[/img]
Villain1: 2000
Villain2: 300

PRE-FLOP
Limper1, Limper2, 4folds, Hero calls 30, Villain2 calls 15, Villain1 checks.
<font color="green"> Just Calling is obviously a Mistake, in Retrospect </font>

FLOP 4[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/club.gif[/img]
Villain2 bets 250 and is all-in, Villain1 calls, Limper1 folds, Limper2 folds, Hero calls
<font color="green"> Just Calling is obviously a Mistake, in Retrospect </font>

TURN: 4[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img]
Villain1 checks, Hero bets 300, Villain1 raises 1700 and is all-in, <font color="red">Hero..? </font>

What should Hero do?
How horrendous were the flop and preflop calls? [img]/images/graemlins/crazy.gif[/img]