It depends heavily on what you're doing, where you're located, and how much you're raising.
For example, I would recommend Jerry Neumann (reactionwheel.blogspot.com) to anyone doing anything in the advertising technology space in New York City. Jerry is deeply thoughtful about the space, knows everybody, and is more than willing to help out in any way he can. But if you're doing something other than an ad technology startup in NYC - well, Jerry's still good, but my recommendation doesn't mean as much.