silent case is a very relative term. what I may consider loud may be considered silent to some other people. there is very few "standard reference" that is universal enough that people can relate to... generally I use central air conditioner as a point of reference for "quiet" since most of us are able to fall asleep to the noise level of a central air conditioner. of course "silent" would be more quiet then that. to some, silent means just that. 0db. no noise at all. however that's unrealistic given the power level of modern computer components (and the fact that the TNN500AF is no longer in production)
so... when you say "silent" what do YOU consider an acceptable level of noise? central air conditioning? compressor of your refrigerator? it also depends on the ambient noise level the computer is going to be located... a computer in your bedroom will need to be quieter then a computer in your living room simply due to the size of the room and the amount of ambient noise that exists in the 2 locations.
other considerations include what kind of components are you going to be putting into the machine? you can' really expect "silent" when you are running that triple SLi of 680's unless you are running some very exotic plumbing to go along with that system
just eyeballing your sig rig, i can tell you that you wont be getting anywhere NEAR silent unless you are running some MASSIVE external plumbing for cooling (multiple phobya 1080's on either passive cooling or 500rpm 180mm fans would help a great deal towards silence)
in short, no SINGLE case (not even something as big as caselab) would provide "silence" to your sig rig simply because you will need massive amount of fans just to keep that rig cool in the 1st place.
