$10 27 player -- misplayed monster draw?

[Blackluck]

Not sure if this should got to STT or here; 27 player $10 SnG.

I don't use any poker tools yet (SnG wizard, etc.)

BB hasn't played a hand yet on the final table; MP1 has suffered some big losses, one to a player holding 10 2 (guy rivered his gutshot) and to me, where he tried (and failed) a bluff on the river. I have his limp range as pretty wide but not maniacal. I check the flop to set up a CR, even though I am readless on BB but I'm almost certain MP1 is going to bet regardless of his hold cards. I also think I have the best hand at the moment, but even if I don't I have a gazillion outs:

Should I lead out?
If not, what should the CR be? (I'm working on bet sizing properly, and trying not to fold too much)

PokerStars Tournament, Big Blind is t200 (8 handed) Converter on pregopoker.com

UTG (t725)
UTG+1 (t7450)
MP1 (t3735)
MP2 (t5055)
CO (t2600)
Button (t4970)
Hero (t4980)
BB (t10985)

Preflop: Hero is in SB with 7[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/club.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, MP1 calls t200, <font color="gray">MP2 folds</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, Hero calls t100, BB checks

Flop: (t600) 7[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/club.gif[/img] (3 players)
Hero checks, BB checks, <font color="red">MP1 bets t600</font>,