[11t]

Betting the pot here isn't a bad thing. Just because they folded doesn't mean it was your fault for betting. However Betting 3/4 of the pot (like 375) is probably what I would have done.

You don't want to bet small (or god forbid check this board), get called, have a scare card hit on the turn and then be facing a big bet. Your line is far better than getting de-stacked by a turned straight.