I wouldn`t mind knowing more.... but i`m just guessing that there are about 20 million people out there with great ideas for websites but no technical talent.
A requirements document of some sort would be beneficial so a prospective programmer might get an idea of how much time they`d have to invest. You don`t have to be specific about the idea just the architecture that the idea would require... and what`s the potential rate of return. How are you going to market said idea? How is the site monetized? Will this be an LLC?
You have stated:
"I want to keep the fixed costs low. Because that way I can wait for the site to be profitable."
Programmers need to eat too you know.... it`s easy for the guy that invests nothing more than an "idea" to wait.... he`s invested only a little inspiration. The programmer on the other hand has some real opportunity costs to deal with. (S)He can actually be earning a profit off of their labor working with someone that has enough faith in their "idea" to invest a little cash up front.
80% of all new businesses fail... so who`d be taking the biggest risk pursuing YOUR idea.... you or the programmer. And if you really think that the only thing neccessary for a successful website is the idea (I wouldn`t let the programmers know this is how you feel)... I doubt you find many willing to help unless there`s cash up front.
Just my opinion mind you. Worth about 2 cents on the open market.