What do I do on this turn?

[Pharcyde]

I've been lurking in this forum for about 2 months, mostly reading the SSNL Digest. The posts I've read have really helped my play, but I still find myself in situations where I just don't know what to do (like the one below). Any advice on this hand would be greatly appreciated.

I've been at the table for about 3 orbits. Villain has been pretty aggressive preflop, and has always followed his PFRs w/a C-bet on the flop.

Party Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
9 players
Converter

Stack sizes:
UTG: $21
UTG+1: $52.97
MP1: $50.90
MP2: $22
MP3: $16.91
CO: $30.80
Button: $24.25
SB: $20.31
Hero: $24.02

Pre-flop: (9 players) Hero is BB with A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img]
3 folds, MP2 calls $0.25, MP3 folds, <font color="#cc3333">CO raises to $1.1</font>, 2 folds, Hero calls $0.85, MP2 folds.

Flop: T[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] ($2.55, 2 players)
Hero checks, <font color="#cc3333">CO bets $2.5</font>, <font color="#cc3333">Hero raises to $7.5</font>, CO calls $5.

Turn: T[img]/images/graemlins/spade.gif[/img] ($17.55, 2 players)
Hero checks, <font color="#cc3333">CO bets $10</font>, Hero ???

P.S. How the hell do you get bisonbison's hand converter to work?