what to do w/TT overpair facing turn bet?

[cd1680]

Full Tilt Poker - Pot Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $111.70
Hero (BB): $100.00
UTG: $168.85
MP: $111.30
CO: $170.70
BTN: $33.90

Preflop: Hero is dealt T[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/spade.gif[/img] (6 Players)
UTG folds, <font color="red">MP raises to $3.50</font>, CO calls $3.50, BTN calls $3.50, SB folds, Hero calls $2.50

Flop: ($14.50) 5[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/spade.gif[/img] (4 Players)
<font color="red">Hero bets $10.00</font>, MP folds, CO calls $10.00, BTN folds

Turn: ($34.50) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $20.00</font>, Hero ???

this is a tough situation. i have been in this situation more than just this time, though not against this villain. villain stats are 24/7/0.64 over 400 hands. my stats are about 12/9/3.2 over 230 hands. whats the best move here?