I'd bet 400-500 at it and be happy with a call or a fold in response.

A reraise would have me counting the numbers and probably calling.

This is probably the kind of situation where my game has changed the most in the last couple of months. I'm winning more hands on the flop where I'm playing draws reasonably strong (usually with not so many outs as this one ie just OES or nut flush). Previously I'd try to see the turn cheaply and hand the initiative to the other guy. One of the benefits is there is less of a difference between my play on a nut flush draw and a TPTK on the flop (assuming someone is paying attention).

Obviously there's occassions when I've had to walk away to a reraise or made the wrong decision on the turn, and it's dependant on having the chips but the added aggression (albeit fairly restrained) has definately rounded me out as a player.