30+3 hand that I never know what to do.

[People_Mover]

Table has been pretty tight. I've been opening about once an orbit and taking it down with cont. bets. Average stack is 3400. I have around 4500. 170 left, top 120 cash. I've only shown down one hand which was a set against AK. The chip leader just sat down across the table and has 18K.

100/200 Blinds

I open in MP1(4500) with 7 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/club.gif[/img] to 500.
Folds to the CO who pushes for 2100.
Big stack from the button calls. Folds back to me.

Is this a push, fold, or stop and go? 100% sure the big stack isn't going to check it down.

Normally I would fold 66 and down and AQ and down here, but 77 just makes me feel [img]/images/graemlins/smirk.gif[/img]