$11: Ist round, big blind, top pair & straight draw

$11 Hold em, Poker Room

Seat 1: tobysboy ($1,500 in chips)
Seat 2: Drezner ($1,460 in chips)
Seat 3: Slidesguy ($4,010 in chips)
Seat 4: Slyfox121 ($1,480 in chips)
Seat 5: oldfar9 ($1,470 in chips)
Seat 6: Stilleto x ($20 in chips)
Seat 7: Hero [6S,7S] ($1,500 in chips)
Seat 9: CHRISIS1 ($1,480 in chips)
Seat 10: stoy4ika ($2,080 in chips)
ANTES/BLINDS
Stilleto x posts blind ($10), Hero posts blind ($20).

PRE-FLOP
CHRISIS1 calls $20, stoy4ika folds, tobysboy folds, Drezner calls $20, Slidesguy calls $20, Slyfox121 folds, oldfar9 folds, Stilleto x calls $10 and is all-in, Hero checks.

FLOP [board cards 7C,4H,5H ]

Hero checks, CHRISIS1 checks, Drezner bets $150, Slidesguy calls $150, Hero?

I'm wondering if I'm overdoing the "play tight early" idea, because I simply folded. Do you lead out on the flop? Assuming you checked, do you call the 150? My thinking is that Slidesguy almost has to be on a draw too. So even if I hit, I'm at best splitting with him. Unless he has two hearts in which case I have even fewer outs...

I apologize for the format, cannot get the converter to work...