What turned me off the revo is the extra stuff that comes with it, i.e. wireless, hard drives, XP etc. Of course you are going to be paying for this unwanted stuff (which just won't do if you're tight-fisted like me). Although you can get "linux versions" can't you? I assume they would still come with hard drives and wireless though.
I thought the following mini-ITX cases looked quite interesting - I'll be getting the first one for my car as I am in the process of building a carPC running a minimal install debian, but for my media director I won't have any case I don't think - it will be mounted to the back of the TV, so I'll leave the mobo "naked" as it were.http://linitx.com/viewproduct.php?prodid=12699http://www.mini-itx.com/store/?c=3#thinclienthttp://www.ebuyer.com/product/156186