If you just have a proposal, I think it is going to be tough to attract the right talent. I am not necessarily a hacker (or maybe I am, who freaking knows), but I am taking that role on so I can make the first versions of my product. If I can show some traction, I know I won't be wasting anyone's time with my business. Furthermore, the first version doesn't have to be pretty, it just has to be good enough to get by.