Flop 2 pair no kicker

[maryfield48]

I had just sat down and posted in CO when...

Paradise Poker 2/4 Hold'em (9 handed) converter

Preflop: Hero is CO with 3[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img]. Hero posts a blind of $2.
UTG calls, <font color="#666666">1 fold</font>, MP1 calls, MP2 calls, <font color="#666666">1 fold</font>, Hero (poster) checks, <font color="#666666">1 fold</font>, SB completes, BB checks.

Flop: (6 SB) 6[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(6 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets</font>, MP1 calls, MP2 folds, <font color="#CC3333">Hero raises</font>, SB folds, BB folds, UTG folds, MP1 calls.

<font color="green">I raised because I thought I probably had the best hand, but was vulnerable to overcards.</font>

Turn: (5.50 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP1 checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, Hero...?