Think about how YOU want your system to look...start reading all the magazines you can...take alot at as many systems as you can get your eyes on. When you find something you like, try it in your system. Each and every person is different, and you can make your system an extension of yourself:
If you are usually the hit of a party, the social butterfly type, then a Highlighted system would probably work great: Bright colors, neon lights, mirrors, plexiglass...if you are somewhat reserved then you might like to do less lights and such, but use higher quality material like leather and motors to hide stuff.
The best part is that you can do everything the way you want.