Ask HN: product first or team first?

I recently decided to leave my job to pursue an idea I had with respect to statistical analysis of code. I'm running off savings for now and can't really pay anyone with cash. Where should I be focusing my energy: developing a prototype that I can use to attract willing developers/business people, or attracting people to work with me on building the damn thing? Convincing people to work with me is easier if I have something up, but building something up gets easier with people working with me! This seems like a chicken-and-egg situation and I'm curious what fellow HNers have tried.