I need to be honest, I like the site pretty well. It's simple, clean, and organized. It's easy to read - white on black is very easy on the eyes. Also, given that your clientele will likely be people who aren't all that skillful with computers - which is the reason they're seeking your services, I think that a very simple, easy to navigate site such as this is perfect for your target audience. I wouldn't stress too much about (lack of) color.
My only gripe is that the front page does not match any of the other pages...! Also, don't take this the wrong way, but I'm not a big fan of the diamond on the front page. I don't really have any idea as to what to replace it with, though, so that's not the most construtive criticism. I would work to make the front page look more like the rest of it. Hope that helps.