Seconding this. You're not going to have a perfect site specifically because you haven't launched. Without audience feedback, all you're doing is endlessly second-guessing yourselves - that sort of feedback exacerbates any existing groupthink behind the design, potentially causing it to be far less usable than it originally was.
Third, launch then get feedback, interate quickly. I was scared when I launched my startup, but you will realize it takes time to get users to try your service out. We were lucky to get techcrunched before launch which led to a bunch of signups for our beta. So we had about 2000 users on our list prior to launching.
