Made Flush - Limp Reraise - Can I fold?

[Poker Jon]

Hi All,

Villain in this hand seems to be a TAG and isn't throwing his chips round a fair amount. He is playing ABC poker. History, is that I made a huge riuver bluff on him (not shown) about 30 hands or so ago, and he definately laid down a bid hand, so I think I can give him some form of respect.

In this example, I didn't know whether I was up against a bigger made flush, with Villain holding AcXc, or whether it was the bare Ace of clubs?? Can I find a fold here.

Also how much does the SB flat call alter our play??

PokerStars No-Limit Hold'em Tourney, Big Blind is t600 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

UTG+1 (t8225)
MP1 (t3285)
MP2 (t22290)
MP3 (t16003)
CO (t40730)
Hero (t36743)
SB (t22555)
BB (t14140)
UTG (t20220)

Preflop: Hero is Button with 5[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">UTG raises to t1800</font>, <font color="#666666">5 folds</font>, Hero calls t1800, SB calls t1500, <font color="#666666">1 fold</font>.

Flop: (t5500) 9[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, UTG checks, Hero checks.

Turn: (t5500) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets t600</font>, UTG calls t600, <font color="#CC3333">Hero raises to t4200</font>, SB calls t3600, <font color="#CC3333">UTG raises to t18370</font>, Hero??????

Cheers,

Jon