I just picked up the blue Platinum Series case (apparently a rebadged Seidio Active case, including holster) at a local Best Buy today. Without a phone to put it in yet, it's hard to tell how it will work in practice, but the material has a nice touch and the back is felt-lined (as is the holster - phone goes face-in). Not sure if I'll end up using the holster much since I'm more of a pockets guy, but both seem pretty well-built.
I'll probably also get a car dock since I use my OG Evo for GPS a lot and I expect to keep doing so with the LTE. The one Sprint is selling looks adequate enough - according to the booklet ISN posted today, the part number is KPH6886V - although I really would prefer something closer to the more rugged and adjustable design of the Seidio car dock for the OG Evo.