Pokerroom 5+0.5: Hero folds a straight

[ticks]

I havent been paying attention, so no reads.
I like to think I played this well, but still Id like some feedback.
Pot the turn maybe?
Anyone call that river?

Seat 2: Rulle A ($1,180 in chips)
Seat 3: MunkeyButtz ($3,630 in chips)
Seat 5: Hero [4H,5H] ($1,530 in chips)
Seat 6: Bella51471 ($1,810 in chips)
Seat 7: elysse6 ($3,525 in chips)
Seat 8: Thaler ($1,510 in chips)
Seat 10: perwilli ($1,815 in chips)
ANTES/BLINDS
MunkeyButtz posts blind ($25), Hero posts blind ($50).

PRE-FLOP
Bella51471 folds, elysse6 calls $50, Thaler calls $50, perwilli calls $50, Rulle A folds, MunkeyButtz calls $25, Hero checks.

FLOP [board cards 7C,7D,3C ]
MunkeyButtz checks, Hero checks, elysse6 checks, Thaler checks, perwilli checks.

TURN [board cards 7C,7D,3C,6H ] Pot=250
MunkeyButtz checks, Hero bets $150, elysse6 folds, Thaler calls $150, perwilli folds, MunkeyButtz folds.

RIVER [board cards 7C,7D,3C,6H,KC ]Pot=550
Hero checks, Thaler bets $1,000, Hero folds.

[handsome]

Looks fine to me.

[jeffraider]

I probably call here and occasionally lose, but really, this bet doesn't look too scary to me. The only scary hand he has is a small flush, I think, but even people with a small flush will understand that it's unlikely that their bet will fold out a higher flush.

[ticks]

So what do you think he calls the turn with?