ATo from EP

[BiffMan]

Mostly interested in opinions on the turn play, but please provide any other feedback. Table as a whole is pretty loose (45%), but both MP2 and button are pretty tight with decent post flop aggression (button: 26/0/1.3 f/30 hands, MP2: 11/6/1.6 f/80 hands) so the flop play freaked me out a bit and had me unsure what to do at the turn...

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Hero is UTG+1 with T[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img]. MP1 posts a blind of $0.5.
<font color="#666666">1 fold</font>, Hero calls, <font color="#666666">1 fold</font>, MP1 (poster) checks, MP2 calls, MP3 calls, CO calls, <font color="#CC3333">Button raises</font>, <font color="#666666">2 folds</font>, Hero calls, MP1 calls, MP2 calls, MP3 calls, CO calls.

Flop: (13.50 SB) A[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">Hero bets</font>, MP1 calls, MP2 calls, MP3 calls, CO folds, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, MP1 folds, <font color="#CC3333">MP2 caps</font>, MP3 folds, Button calls, Hero calls.

Turn: (13.75 BB) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">MP2 bets</font>, <font color="#CC3333">Button raises</font>, Hero???