Rhyno Lites for me also. Mavic A719/T519's have also been flawless over hilly, rocky, rutty, and overall primitive local back roads. I have a set of Alex DM24 wheels I have not used, but I'm sure they'll be good also. Of course, the quality of the build has much to do with the qualifying a rim. If you ever read of rim reviews on a site like MTB review, most of the negatives stem from crappy wheel builds to begin with, then they fault the rim alone.
I like rims with thick sidewalls. I also use only tubes.