Played this one stupid?

[TWINUNO]

Seem him make some pretty donkish moves. Mostly his hand selection and what he is limping. Probably should have came over the top all in?
***** Hand History for Game 2477577664 *****
NL Texas Hold'em $10 Buy-in + $1 Entry Fee Trny:14542262 Level:5 Blinds(75/150) - Thursday, August 04, 17:06:25 EDT 2005
Table Table 11765 (Real Money)
Seat 4 is the button
Total number of players : 6
Seat 6: HERO ( $2567 )
Seat 4: Jlovel124 ( $384 )
Seat 10: pipes42 ( $900 )
Seat 5: money325 ( $930 )
Seat 3: birdieone222 ( $1394 )
Seat 7: moonshine314 ( $1825 )
Trny:14542262 Level:5
Blinds(75/150)
** Dealing down cards **
Dealt to HERO [ 3d 9d ]
moonshine314 calls [150].
pipes42 folds.
birdieone222 folds.
Jlovel124 folds.
money325 folds.
HERO checks.
** Dealing Flop ** [ 6s, 3s, 9c ]
HERO checks.
moonshine314 bets [300].
HERO raises [800].
moonshine314 calls [500].
** Dealing Turn ** [ 4s ]
twinlentini checks.
moonshine314 bets [150].
HERO calls [150].
** Dealing River ** [ Ah ]
twinlentini checks.
moonshine314 bets [300].
HERO calls [300].

[LowDown22]

If I elect to checkraise this flop I'm raising more than 800. Probably just put him all-in right there. The flush draw scares me and I don't want to take the chance of my 3s getting counterfeited later on in case he has A9 or something. But I would have just bet this flop instead of getting fancy.