FTP - $55 SNG. Whats the play here?

Hi guys, i am a lonnnng time lurker, first time poster, I have a question about the best play here is..

Heres the situation, 5 players left.. been this way for sometime, read on villan is that he is a pretty straight foward player, usually raises 3.5x blind when raising.

I am in the big blind, he is on the button.. heres the situation.

FullTiltPoker Game #269092540: $50 + $5 Sit & Go (1733820), Table 1 - 100/200 - No Limit Hold'em - 19:54:03 ET - 2005/10/28
Seat 1: rjkcr (3,045)
Seat 3: 32unsuited (1,345)
Seat 4: smogdwg (1,600)
Seat 6: 1Cowboys (2,020)
Seat 8: Astoria Warrior (5,490)
smogdwg posts the small blind of 100
1Cowboys posts the big blind of 200
The button is in seat #3
*** HOLE CARDS ***
Dealt to 1Cowboys [Qh 3h]
Astoria Warrior folds
rjkcr folds
32unsuited raises to 400
smogdwg folds
1Cowboys calls 200
*** FLOP *** [2h 6d 5h]

he is at 945 chips now and im at 1620. his raise of 2x the bb worried me as he almost seemed to be urging a re-raise or call with a monster.. i called the raise and the flop was exactly what i had hoped.. flush draw with a gutshot.

What's the best play here?

I will post what i did and results after i get some advice.
Thanks!!