Ok, four things.
1. Post the brand and model of EVERYTHING. There are far too many sites (like yours) that say AMD 1.13GHz, and then "40gig hard drive". Would you buy a "300MHz" processor? Of course not, you could get a whole bunch of different things. Most people here feel the same way about every piece of a computer. If I don't know exactly what brand of power supply (for instance) comes with the computer, I won't buy it.
2. As for customization, offer drip-down boxes for the choices. Don't make people guess at what you carry.
3. Selection, selection. The fastest AMD is a 1.13GHz. What if I want a 1.4?
4. Your website could use a little work. It's nice, but remember that you're competing against places like Alienware and Falcon NorthWest, who have great looking websites.
Sorry to critique your business, but since you posted it saying how good you are, I figured I'd help you out with that ego of yours
Good luck though, hope you're a success.
P.s. Here's another idea: customized cases. Offer fans, blowholes, different colors, whatever. People like that.
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Whoever thinks up a good sig for me gets a prize