sm pair + OESD, 2-suited flop

[ellipse_87]

BB 25/16/infinite (yet to call when seeing flop) after 32;
UTG 22/0/4.0 after 9;
MP1 13/6/3.0 after 32;
CO 28/13/0.8 after 32

Party Poker 2/4 Hold'em (8 handed) converter

Preflop: Hero is UTG+1 with 5[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/heart.gif[/img]. MP2 posts a blind of $2.
UTG calls, Hero calls, <font color="#CC3333">MP1 raises</font>, <font color="#666666">1 fold</font>, CO calls, <font color="#666666">2 folds</font>, BB calls, UTG calls, Hero calls.

Flop: (11.50 SB) 3[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
BB checks, <font color="#CC3333">UTG bets</font>, Hero ....

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In deciding how to proceed, how much significance do you give

(1) the flush draw
(2) the chance of chopping with another 5
(3) the fact that a set may complete a straight

With position on UTG, my inclination is to raise, but there are three behind me.