Party $6: flopped straight, 2-tone, 8-way pot

[laivu6]

Party Poker No-Limit Hold'em Tourney, Big Blind is t40 (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

UTG+1 (t1600)
UTG+2 (t3000)
MP1 (t3000)
MP2 (t2440)
MP3 (t1940)
CO (t1550)
Button (t1440)
SB (t1030)
Hero (t2000)
UTG (t2000)

Preflop: Hero is BB with 5, 6.
UTG calls t40, UTG+1 calls t40, UTG+2 calls t40, MP1 calls t40, MP2 calls t40, 2 folds, Button calls t40, SB completes, Hero checks.

Flop: (t320) 3, 4, 2 (8 players)

SB bets t40, Hero?

With so many ppl in the hand I don't want to slowplay this (or do I?)... but what's the plan here?

[TLR]

I raise about pot size here, you want the A4 and PP higher then 4 to call or raise but the flush draws to fold