$27 turbo - 9-high flush

[housenuts]

Should I be going all-in here? Am I overthinking a simple play? I've pretty much played it like I have a flush and he doesn't seem to be scared. Can he have a higher flush? Would he call an all-in without a flush?

Is there any sense in calling? I can't make an argument for it. Just need some confirmation. Thanks.
PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (9 handed) converter

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

Button (t1500)
SB (t1500)
<font color="#C00000">BB (t1500)</font>
UTG (t1500)
<font color="#C00000">Hero (t1500)</font>
MP1 (t1500)
MP2 (t1500)
MP3 (t1500)
CO (t1500)

Preflop: Hero is UTG+1 with 9[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, Hero calls t20, <font color="#666666">1 fold</font>, MP2 calls t20, <font color="#666666">1 fold</font>, CO calls t20, <font color="#666666">2 folds</font>, BB checks.

Flop: (t90) J[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">BB bets t60</font>, Hero calls t60, MP2 folds, CO folds.

Turn: (t210) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t100</font>, <font color="#CC3333">Hero raises to t350</font>, <font color="#CC3333">BB raises to t780</font>, <font color="#CC3333">Hero raises ?