My 10' drop freeride buddies swear by their Atom Lab Trailpimps. or Azonic Butcher rims, (if you can find them). I'm not that brave yet! My biggest drop is about 3'0". I've never had much luck with Sun rims, and prefer Mavic products over the Sun's. I had a pair of Alex Triple wall and they were super beefy and stout, never knocked them out of true!
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger