It's funny what a couple years can do. I have a set of the silver Deemax's that registered 2215g on my scale when I built my current DH bike 2 years ago. At the time, they were fairly light (especially being UST), but not really anymore, as you mentioned. And, it will be sweet when 1600g DH wheelsets come down to a reasonable price!They are also not that light. 2150g is not really great considering new easton dh wheels are 1850g and supposely they have a 1600g carbon dh wheelset for the next year.
On a separate note, Stan's can't be too far from a DH rim, as Sun Ringle is licensing the Stan's profile for the new ADD wheelsets. But, apparently the license agreement says Ringle can only sell complete wheels, not individual rims. So, a "Stan's" DH rim does exist, but it is made/sold by Sun Ringle and only available as a pre-built wheel.
http://www.sun-ringle.com/mtb/wheelsets/add/