Great design. Nice start. A few issues to consider.
1) I confirmed what the other poster said. Your page is to wide at 800x600. Tested with IE and N
2) The "monochromatic" design is very very nice but you need to be carefull about your "tabs" which are of course links like home, price list, etc. The text/tabs are not prominent enough. I suggest sliding them all to the far left, making the tab and the type a little bigger, and maybe play with a drop shadow on the type.
3) At the bottom of all your pages you need a "Top of Page" link. I prefer to build these in from day one so I don't forget them
If you are using "includes" you could just put this link in that file.
4) You might want to consider "key words" in some of your graphics ALT tags. Some engines do look at this stuff.
Most of the above is nit picky stuff but always important on a high quality site like yours. Best of luck