The reason I was thinking of a server case is it's flat and can be stored in a semi out of the way place. My current "server" tower case I've had for 5+ years and has always...always had a vibration hum on the top exhaust fan area that I have to place something heavy on to keep the hum down to a minimum. The case also was damaged somehow and is literally warped as well, the case seems offset and doesn't balance on the feet correctly either.
Hence the server case idea being it's flat yet large enough I guess to allow easy access for replacing parts. I just purchased a XFX HD Radeon 6770 & new Corsair GS700watt PSU. Even with as large as this case is the PSU cabling is causing some issues right now, I literally had to wedge the backside of the case on and ...there is a noticeable hump now....
I was debating purchasing one of the HAF series of cases as a friend of mine that I helped build his PC purchased the HAF full tower case (not sure of the model) but I was impressed with the fan size/amount of them and how quiet the case was.
Another reason I was considering a rackmount case was I am toying with the idea of building a custom PC desk, as you can see from the previous post the desk with the monitor mount is fairly large, I had to enlarge the desktop to accommodate for how far the monitor mount stuck out over the original desktop & the PC sits to the right.
The idea I'm still toying with is either a custom desk like the L3p D3sk seen here
except it would be a free standing desk. The other idea being a somewhat similar desk but with the PC/case being mounted underneath in somewhat of a pullout box/drawer.
My dilemma is, large case for ease of use or minimalist for the neat look and easy...storage or placement while sacrificing space in the case which obviously leads to cooling issues.