200K on Party Bust Out Hand, what did I do wrong?

[WebGuySteve]

Here's the hand, should I have maybe reraised allin on the flop? Should I have known he had the flush? I figured with a small check raise like that, he might have the A [img]/images/graemlins/diamond.gif[/img] What do you guys think?

#Game No : 1231637861
***** Hand History for Game 1231637861 *****
NL Hold'em Trny:7490897 Level:4 Blinds (25/50) - Saturday, November 27, 23:21:43 EDT 2004
Table $200K Guaranteed Saturday(138067) Table #13 (Real Money)
Seat 9 is the button
Total number of players : 9
Seat 1: FTC12 ( $2140 )
Seat 2: proshark ( $4760 )
Seat 3: WebGuySteve ( $1850 )
Seat 5: Howiehh ( $6264 )
Seat 6: Joerigger ( $2255 )
Seat 9: Newb_Hunter ( $1275 )
Seat 4: kobalicious ( $1675 )
Seat 7: JohnCash702 ( $1020 )
Seat 8: HINK69 ( $2513 )
Trny:7490897 Level:4
Blinds (25/50)
There is no Small Blind in this hand as the Big Blind of the previous hand left the table.
** Dealing down cards **
Dealt to WebGuySteve [ Kd Kh ]
proshark calls [50].
WebGuySteve raises [150].
kobalicious folds.
Howiehh folds.
Joerigger folds.
JohnCash702 folds.
HINK69 folds.
Newb_Hunter folds.
FTC12 folds.
proshark calls [100].
** Dealing Flop ** [ 2d, 3d, 9d ]
zareef has joined the table.
Player zareef has been seated on table $200K Guaranteed Saturday(138067) Table #88 table
proshark checks.
WebGuySteve bets [300].
proshark raises [600].
WebGuySteve calls [300].
** Dealing Turn ** [ 4s ]
proshark bets [600].
WebGuySteve is all-In.
proshark calls [500].
** Dealing River ** [ Th ]
proshark shows [ 4d, Qd ] a flush, queen high.
WebGuySteve shows [ Kd, Kh ] a pair of kings.