I'm a little late to the thread, but have you considered building your own? Either way $500 should be plenty, but I got a lot of satisfaction from building my wheels. I've gotten two sets of carbon rims from Peter, one 29" with 25 mm internal width and one 27.5" with 35 mm internal width. Both are for my -057. Building them up was no trouble at all, following some online calculators for getting the right spoke size and how to put them together. If I was doing it again I think I would go with a 35 mm internal 29" rim. The -057 frame is too narrow to fit really large tires, but a 2.4" tire on the wide rim gives great cornering and at 200 lbs I can run 18-20 psi in the rear.
On both wheelsets I used DT Revolution spokes. No problems, even with my weight riding on lots of rocks and roots (Southeast US trails).
I used DT Swiss 350s on the 29" rims and they have been great. For the wider 27.5" rims I decided to try XT hubs- the pair of hubs costs about the same as the front 350 hub (mine were ~$70 for the set), and they only weigh a couple of ounces more than the 350s. The XT hubs have been great as well- they have 36 engagement points and have not given any problems, though they are due to be opened up and re-greased.