Flush draw and mid-pair, 50+5 hand

[BDarch]

***** Hand History for Game 2094299529 *****
NL Hold'em $50 Buy-in + $5 Entry Fee Trny:12464530 Level:2 Blinds(15/30) - Monday, May 23, 17:38:40 EDT 2005
Table Table 12327 (Real Money)
Seat 3 is the button
Total number of players : 8
Seat 2: neighbours ( $1353 )
Seat 3: fedya21 ( $810 )
Seat 7: wolfster71 ( $1027 )
Seat 9: HungryGhost ( $860 )
Seat 10: colonel23 ( $1730 )
Seat 4: ramz000 ( $2005 )
Seat 5: BDarch ( $975 )
Seat 6: Joey_A ( $1240 )
Trny:12464530 Level:2
Blinds(15/30)
** Dealing down cards **
Dealt to BDarch [ 8d Ad ]
Joey_A calls [30].
wolfster71 folds.
HungryGhost calls [30].
colonel23 folds.
neighbours calls [30].
fedya21 folds.
ramz000 calls [15].
>You have options at Table 11900 Table!.
BDarch checks.
** Dealing Flop ** [ Ks, 8s, 7d ]
ramz000 checks.
BDarch checks.
Joey_A checks.
HungryGhost checks.
neighbours checks.
** Dealing Turn ** [ 4d ]
ramz000 checks.
BDarch bets [75].
>You have options at Table 12378 Table!.
Joey_A calls [75].
HungryGhost folds.
neighbours folds.
>You have options at Table 14036 Table!.
ramz000 raises [400].
BDarch ???

The checks on the flop made me think I probably have the best hand and the 4d on the turn seemed like a safe card but then the SB's check raise confused me. The SB had played fairly loose so far and his check raise could mean a variety of things. I've been questioning my decisions a lot more lately because of a run of variance and was wondering what the consensus on this hand would be.

[scdavis0]

Just gotta dump it.