Antec Solo is the best case I have ever used; in fact, the only case I've ever liked of every case I've had to deal with (mine or someone else's). After a lot of research, I bought one for my parents, and the thing is really super-quiet, really nice-looking (black model), and very solid.
I got an Antec NSK6580 for myself when I noticed that it was on sale for $50, less than the price of a power supply alone (it comes with a decent-quality PSU). My thought was that "Well, it LOOKS a lot like a Solo, and even if I throw the case away and keep the power supply I still come out ahead", so I bought one.
However, it is flimsy-feeling and has external holes over the CPU socket that let out a lot of noise. The thinner steel also lets through a bit of sound. So after a week I finally caved, went back, and bought a second Solo after all. The PSU that came with the NSK6580 is fine, though not as nice as the Seasonic I used for my parents.
The only flaws I can point to in the Solo are that the feet (if you choose to attach them) don't stay on very well; they're silicone pads with adhesive that does not hold tight. Otherwise it is basically perfect. I'd recommend it to anyone except those who want loud cases with flashing LED fans mounted all over and visible externally.
As you can see, it has a pretty massively positive rating on Newegg, and looks like it happens to be on sale right now for $59 instead of normal $99. Lucky!