Overpair facing check-raise

[birdman6fo]

Villain is 15/10/3.55 over 200 hands. No other reads. What do you guys do in this spot?

Full Tilt Poker - No Limit Hold'em Cash Game - $1/$2 Blinds - 9 Players - (LegoPoker HH Converter)

SB: $212.00
BB: $263.75
UTG: $157.00
UTG+1: $75.35
MP1: $149.60
MP2: $36.95
MP3: $465.95
CO: $200.00
Hero (BTN): $450.80

CO posts $2.00
Preflop: Hero is dealt 8[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/club.gif[/img] (9 Players)
2 folds, MP1 calls $2.00, 2 folds, CO checks, <font color="red">Hero raises to $11.00</font>, 2 folds, MP1 calls $9.00, CO folds

Flop: ($27) 2[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/heart.gif[/img] (2 Players)
MP1 checks, <font color="red">Hero bets $20.00</font>, <font color="red">MP1 raises to $52.00</font>, Hero...?