NL25: do I have to lay this hand down?

[MickChecker]

Full Tilt Poker - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $52.55
BB: $25.90
UTG: $41.10
CO: $23.45
Hero (BTN): $61.40

Preflop: Hero is dealt 5[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/spade.gif[/img] (5 Players)
UTG calls $0.25, CO folds, <font color="red">Hero raises to $1.10</font>, SB calls $1.00, BB calls $0.85, UTG calls $0.85

Flop: ($4.40) 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] (4 Players)
<font color="red">SB bets $4.40</font>, BB folds, UTG calls $4.40, Hero calls $4.40

Turn: ($17.60) A[img]/images/graemlins/diamond.gif[/img] (3 Players)
<font color="red">SB bets $9.00</font>, UTG calls $9.00, Hero??

SB was solid tight aggressive, 17/14/4 over 100 hands. UTG was something like 24/11/1.7 over 300 hands.
I was thinking hard, whether the "I have a set, so I push" rule was correct here, there might be straights, straight- &amp; flushdraws or even bigger sets out there...
Anybody reraising that flop?
Anybody not calling that turn?