HTPC Case with Room for X-Fi?

Hello guys,

I've been reading this forum for some time, an now I need your good advise My old (clunky Tower)PC that served as an XBMC Media Center has "vaporized".

However, now I want to build an real HTPC. My main question is: Knows anybody a good HTPC that is living-room-compatible and can be equiped with a regular sized PCI-E Soundcard? Since my Audio-Equipment is old but good, it has no HDMI Input, only Analog Multichannel Input. Until I replace my AVR, I want to stick with this solution. And so I want to keep using my Creative X-Fi for the HTPC.

Best Regards,
Robert