bodog 10k -- Bubble w/ JJ

[JustChillin]

i believe at this point there are around 15 people left (paying top 9), i am either 2nd or 3rd in chips, average chip count is around 8-9K. Unfortunately Villian is new to the table so no reads at all.

Blinds: 150-300 25ante

UTG (5,093)
MP (5,5145)
Villian (34,512)
BTN (10,494)
SB (10,167)
Hero (20,273)

Preflop: Hero is BB w/ JJ
1 fold, MP calls 300, Villian raises to 1200, BTN calls 1200, SB folds, Hero calls 1200, MP folds

Flop : 4c 6d 7d (4200)
Hero checks, Villian bets 5000, BTN folds, Hero....?


im feeling like the biggest mistake i made was not repopping preflop. I really didnt want to build a big pot OOP against the chip leader, but i suppose that happened anyway, so now im lost with either option....