In my experience with cars, there has been two poles when it comes to preferences in a vehicles appearence versus its performance.
On the one hand you have the "Show" crowd, and on the other you have the "Go" crowd, and in between you have the "In-between" owners.
I have been part of the Go crowd. I prefer to have a sleeper vehicle that looks stock but actually has performance that exceeds stock under the hood and in the rest of the car. Getting more horsepower rather than a flashy paint job is more appealing to me; or a better suspension to pull more lateral Gs.
It is similar with a computer. I do not care how it looks. The computer must first be stable, then I select components with give me options to overclock, and components which have all of the capabilities I desire.
For example, I currently am running an Intel E6600 at 3.6GHz (50% overclock) on an eVGA motherboard, with 2 GB ram at 1000MHz, 8800GTX (DX10 capable), and a 150GB Raptor hard drive. While it may not be the fastest or most powerful, it is up there in the performance; as well as, the value is excellent because of the overclocking. Additionally, it is totally stable.
The case is a beige server size case, no windows or lights, inside the cables are not all neat and tidy. Those matter not to me. What matters most to me is that I can run applications with all the options turn on.