If Rowland made PC cases.....

Hmm... The Ahanix link there didn't work. Take a look at this:

http://www.ahanix.com/dvine5.html

The Silverstone cases look pretty nice too.

In addition to the case being attractive amongst your equipment, if that is where you will place it, sooner or later your most important consideration will become noise from the various fans in virtually any self-assembled PC.
In order to have a very quiet case, my experience ultimately led me to look for something with large case fans that can rotate at low speeds. I have given up the looks of two Silverstone cases (and they can be very good looking even amongst Levinson equipment) to go to a tower with 120 mm fans with speed controls. The case I selected was a Tsunami, looking somewhat like the vertical Theta power amps, but without the machined surfaces. Available in both black and silver.

I agree with pc noise being a problem in the home audio setup, which is why I like this site:

http://www.endpcnoise.com/

They have a totally silent machine that cools with no moving parts in a soundproof case, nice! It kinda looks like a tower amp on wheels:

http://www.endpcnoise.com/cgi-bin/e/tnn_p4PC.html?id=N2kDiPQo

Not sure if you've already chosen a case, but I just saw this review up on Tomshardware

http://www.tomshardware.com/howto/20050614/index.html

Guys, check out www.hifiatx.com

That's case that's truly at home with the rest of your hifi gear.