I've been trying to choose a rack for a couple of months now and have found it one of the most frustrating audio system decisions I've ever faced. There are so many conflicting opinions as to which approach is best sonically--three different camps. It's not practical to audition these things. (Perhaps Ken Lyon will come by this thread and shed some light on the debate between the three different camps.)
I considered Zoethecus, Salamander Synergy, Billy Bags, Polycrystal, RixRax, Standesign, you name it. In the end, I punted and bought a discounted, discontinued Target rack as a stop-gap. The thing rings like a church bell when you knock it, but it's plenty rigid.
If I could be convinced that the Synergy stuff is not a major sonic compromise, that would probably be my first choice because of the combination of looks, price and flexibility it offers (I like the option of adding drawers). Eventually I want a RixRax, but only if I'm convinced that its sonics are good. Too expensive if it's mediocre-sounding, even if it's gorgeous furniture.
---dan