Ideally they would be interested in whatever area your startup is in. You meet them while interacting in the community around that interest. If your startup is

Ideally they would be interested in whatever area your startup is in. You meet them while interacting in the community around that interest. If your startup is something that doesn't necessarily have a community around it(say bingo cards) then I would try to draw on a community, like HN, where people are more likely to be business minded.