Race Face Diablos Stem, 90mm with a Chris King SteelSet Headset.
Bombproof.
If not your style, try an Azonic Shorty stem with an FSA Pig Headset. Designed for the rigors of DH and DirtJumping.
Or, ....?
__________________
"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