What range of hands is this guy on and should I call?

[judgesmails]

Poker Stars FPP Freeroll WPT qualifer. 66 entries, top nine places qualify for stage two of Freeroll. Down to 16 players.

Average stack about 6100T. I am UTG with 3700T. Blinds are 100-200 with 25 ante.

I am dealt K [img]/images/graemlins/spade.gif[/img]Q [img]/images/graemlins/spade.gif[/img] and raise to 600T. MP, a very loose player who is second in chips with about 18000T calls, everyone else folds. Pot is 1725T.

Flop is 8 [img]/images/graemlins/spade.gif[/img]8 [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/diamond.gif[/img]. I have 3100T left and decide to take a shot at this pot and bet 1500T. My oppoonent raises to 3000T.

What do you put him on? Should I call?

I realize I may have been best off passing on this hand to begin with, but I played and and had a tough time with this decision. I am interested what some of you may have done in this situation.