I just took a look at your site. I offer web site editing as a service through my business. Just off the bat, there was at least one spelling error on the first page, a grammatical error in your welcome box, and I'm not sure off-hand what font you're using, but it makes me dizzy. Doesn't seem like a great choice. No one's going to take the time to edit a site for free. I'd suggest looking into hiring someone, as spelling and grammatical errors make any site, and the company it represents, look unprofessional. If you want an example of rates, you can view mine here:
http://www.jhmattern.com/content/view/56/72/ I generally keep my rates on the low-end. You can find copy editors available on most freelance job sites.