Although I am not that familiar with the products you`re offering or the market you`re advertising to.. but I _do_ have a few suggestions
1.Presenting your products.
On my first visit I found it hard to know what your site offers...if I could suggest posting your products on the front page. .. or just a short version of them.. a small explanation with maybe a picture... those could make the visitor`s experience more enjoyable
2. I think you can remove the paypal banner from your front page.. as a costumer it would just seem like you`re not aiming for my interest, you`re aiming for my money. if a costumer would want to buy 1 of your products or hire your service, he would look for the payment options (the paypal banner in the price list page is a good example)
3. Price list: I think you should label your "Price list" tab to "Products" or to "Purchase" or something people would find more appealing...
On a general note, I think your site`s appearance is strictly professional... if that is the specific crowd you are targeting than it`s all good. but if not, the general user might find it off-putting to have a text only, strictly professional web site.
I hope this was as constructive as I tried it to be.. and not offensive (I`m just trying to help. share my experience as a visitor)
I sincerely wish you the best of luck