Bodog $100K: TP + OESD on flop

[Iron_Yuppie]

I played this hand in the $100K a few weeks ago. I feel like my line was wrong, but I'm not sure how it can be improved.

I've been at the table for a few orbits and don't have any great reads.

Blinds at 100/200. Average stack is I think around 3K - 4K.

UTG+2: ~12K, big stack, active
MP: 4K
CO: 2.8K
SB(hero): 8K
BB: 3K

Preflop: UTG+2 limps, MP limps, CO limps, I complete with 6d5d, BB checks.

(NOTE: 5-way limped pot was defintely not the norm at this table; almost all pots had been raised PF, few limpers)

Flop: 6s4s3h

Pot = 1000

What's your play?

I decide to bet 840. BB folds, UTG+2(big stack) calls, MP folds, CO goes AI for ~2.6k (~1.8k more)

It's now ~1.8K more to you in a ~5.3k pot. Big stack is still in the hand behind you. What now?