$5.50 9man, HU, flop straight on 3 flushed board facing raise

[Yorkshire Pud]

This hand happened towards the end of a SnG I was in last night. Villain wasn't overly aggro and had just checked down TPTK allowing me to river a straight.

Is this the right line?

PokerStars Tournament, Big Blind is t200 (2 handed) Converter on pregopoker.com

Button (t7700)
Hero (t5800)

Preflop: Hero is in BB with 4[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/heart.gif[/img]
Button calls t100, Hero checks

Flop: (t400) 7[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/spade.gif[/img] (2 players)
<font color="red">Hero bets t400</font>, <font color="red">Button raises to t1200</font>, <font color="red">Hero raises to t5600 (All-in)</font>