77 on the bubble

[AndrewB]

NL Hold'em $5 Buy-in + $0.50 Entry Fee Blinds(100/200)

Total number of players : 4

Reads: SB is a LAG, BB liked to chase draws but had yet to raise, UTG won a few races to get back into the game.
Overall it was the standard group of $5 horrible players who didn't fold when they were supposed to.

SB (t4300)
BB (t5000)
UTG (t2200)
Hero (t2400)

Preflop: Hero is Button with 7[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/heart.gif[/img].
UTG folds, Hero raises to t600, SB folds, BB calls.

Flop: (t1300) 3[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img]
BB bets t300, Hero...




Preflop it was either push or raise. I was planning on pushing if UTG limped, but they didn't and so I made my standard 3x raise. Is open pushing here a good line? I don't really want to see a flop with a middle pair but I had 12BBs so I wasn't exactly shortstacked.

Postflop, how do I respond to virtual min-bet? Can I fold to such a bet? Is pushing horrible? I can't see calling being the right play.