*sighs* Wish i had the money to give MbD a good overhaul. 
I wouldn't recommend a new layout for MbD. Speaking as someone who does freelance web design/development, I'd say it would be a bit of a waste to start with a new look when you could improve a few things for much less and achive greater functionality. The one you have now is really good, the only things I can point out that could/should be changed:
- The use of Javascript for rollovers when CSS is all thats needed.
- Javascript on the search input. Not everyone has js enabled.
- Tables used for parts of the layout. Tables should only be for data structure and organization.
As for the content, the categorization can be improved. Its not a problem now but it could be depending on how many items you plan to add in the future. Adding sorting by genre and other such options would be a good place to start.
The "scene and game music store" slogan(?) is interesting, do you plan to just do videogame related music or expand to others? I personaly think it would be nice to see some metal on there
