Another rebuy period question: what do you need to call?

[registrar]

Stars $50r. Villain has been reasonably active/passive. Table is tight.

Poker Stars
No Limit Holdem Tournament
Blinds: t25/t50
8 players
Converter

Stack sizes:
UTG: t1285
UTG+1: t4206
MP1: t1625
MP2: t3546
CO: t1025
Hero: t5583
SB: t3235
BB: t2120

Pre-flop: (8 players) Hero is button
UTG folds, UTG+1 calls t50 <font color="aaaaaa">(pot was t75)</font>, MP1 folds, MP2 calls t50 <font color="aaaaaa">(pot was t125)</font>, Hero calls t50 <font color="aaaaaa">(pot was t175)</font>, Button calls t50 <font color="aaaaaa">(pot was t225)</font>, SB calls t25 <font color="aaaaaa">(pot was t275)</font>, BB checks.

Flop: J[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img] (t300, 6 players)
SB checks, BB checks, UTG+1 checks, <font color="#cc0000">MP2 is all-in t3496</font>, CO folds, Hero?