Weird straight with scare card hand

[wall_st]

***** Hand History for Game 2409354057 *****
NL Texas Hold'em Trny:14178945 Level:1 Blinds (10/15) - Saturday, July 23, 04:58:05 EDT 2005
Table Multi-Table(401284) Table #4 (Real Money)
Seat 6 is the button
Total number of players : 10
Seat 1: arryoudini ( $805 )
Seat 2: EEbones ( $600 )
Seat 3: NCFIXER ( $755 )
Seat 4: PISTOLHOT ( $965 )
Seat 5: dnwood ( $710 )
Seat 6: rapidrob5064 ( $975 )
Seat 7: HERO ( $3015 )
Seat 8: two_armd_men ( $985 )
Seat 10: boozer88 ( $1190 )
Seat 9: Elmo58 ( $2365 )
Trny:14178945 Level:1
Blinds (10/15)
** Dealing down cards **
Dealt to HERO [ 7s 9c ]
Elmo58 folds.
boozer88 calls [15].
arryoudini calls [15].
EEbones folds.
NCFIXER folds.
PISTOLHOT calls [15].
dnwood folds.
rapidrob5064 folds.
HERO calls [5].
two_armd_men checks.
** Dealing Flop ** [ 8h, 3h, 4s ]
HERO checks.
two_armd_men checks.
boozer88 checks.
arryoudini checks.
PISTOLHOT checks.
** Dealing Turn ** [ Td ]
HERO checks.
two_armd_men bets [15].
boozer88 folds.
arryoudini calls [15].
PISTOLHOT calls [15].
HERO calls [15].
** Dealing River ** [ Jh ]
HERO checks.
two_armd_men checks.
arryoudini checks.
PISTOLHOT checks.


So I hit my hand, but wasn't really sure what to do bceause of the flush card and the large amount of people still involved in the pot. I had just planned on check calling a bet of reasonable size on the river, hoping to show down the best hand. If I did bet here I felt like I would have to throw this away to any reasonable re raise.

Really I was hoping someone would just bet their top pair or two pair.

Any ideas about how to go about this ?