Yeah the Zotac I have is a mini-ITX. It's the H55-ITX-A-E. I have 4G of DDR3 in it (wanted 8 just for 8's sake, but couldn't justify the extra 200 bucks) and an Intel Core-i5 650 desktop processor on it with the stock intel heatsink. I've had it running exposed off a desktop PSU and it's quiet enough to be put in the trunk, that's for sure.
I'm currently trying to design a case to be made for everything. I just got the Opus 360 in the mail yesterday. This thing is huge compared to the M2-ATX I have elsewhere.
I need to see what others have done to contain theirs; I'm mocking the case up in Google SketchUp, but my fear of noise/interference has me making baffle panels between drives and boards.
Do any of you have any pics of your cases/etc that you've put an Opus in?