Well, it depends on what you are looking for and how much you are willing to spend.I spec‘ed a PC with the same hardware as the one I am building. They want almost $1000 more more money than the folks at QuietPc do for the same hardware in a Streacom case. Is their case worth $900 more? I thought about Rock but decided I wanted control of the OS.
If the net price difference is 900 USD, then it's probably not worth it. Last time I've checked, their biggest case was around 400 USD from the total build cost. Expensive, but beautifully crafted and assembled. The cooling is very efficient, despite the small form factor.