hardware that's *not* quiet or small?

Hi,

I'm looking for a mostly pre-built system (meaning I don't mind throwing a graphics card in or some ram, but that's about it..) for xbmc on linux.

The thing is it will be in a utility room serving a tv through the wall, so it doesn't have to be small, quiet, or efficient. Media will be over the network (nfs) so no need for a lot of disk space. No need for ssd or wifi.

I've looked at cheap dells, but they have weak power supplies generally so I'm not sure about putting an nvidia card in there..

I assumed it would be easy to find a cheap generic ugly-ass box, but it seems like the silent living room friendly types are more common now.

I'm running in another room xbmc on a xios currently (it's really decent for the price, and if you upgrade the firmware and accept it's still beta - remote is the worst part..), have a linux server providing data (use linux at work all the time), so I have no software fear. This is for my media room and I just want it to be a super smooth, awesome xbmc experience, capable of HD audio and 3D (maybe..), definitely 1080p.

Any ideas?

Thanks for any clues!