desperation or good move?

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) converter

Small stakes, people have been limping with junk.
I was pretty sure I had the limper beat. Should I fold/call/raise, what do you guys think?
UTG (t1640)
MP (t4725)
CO (t3735)
Button (t570)
Hero (t720)
BB (t2110)

Preflop: Hero is SB with K[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 fold</font>, MP calls t100, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t720</font>, <font color="#666666">1 fold</font>, MP calls t620.