I like the turn check cos there's only three diamonds in the deck that he can call with really, but thousands of stupid hands that he can bluff with, and he might catch a set or thinks he can call for a split on a 4th diamond. If he calls the turn, he calls all rivers as well, so we're not in a hurry to get it in.
90c on the turn is also lots of fun, but maybe too much fps.
wp.