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I really think that you did a very good job on this! I can only come up with a few suggestions..
When I hover 'Choose Your Brand' I feel that the drop down menu should be underneath instead of off to the side.
The mouse should change to a hand (cursor:pointer;) on hover.
It seems like you could find a way to use the empty space below the easy search (on pages other than the home page). It just feels a bit empty.
The listed brands on the home page do not seem like links. It looks like a static list of brands you carry, not like links to their respective pages. Maybe find a way to make this a bit more clear.
Overall a very well done site in my opinion!

Also, the tree from your logo would make a good favicon.