I have a bad back and can't use drop handle bars. To get the maximum flexibility i put this handle bar on my bike:

Nashbar Trekking Mountain Bike Handlebar
http://www.amazon.com/Nashbar-Trekki.../dp/B004UMC110

Generally i'm happy with it, but i've been trying to use a couple stems but still not happy with the adjustments that are possible. Accidently i ran across this which looks to have quite a bit of adjustments. But no reviews.. anyone familiar with it?

Satori Turn up Adjust Handlebar Stem Riser 25.4 X 100 1-1/8"
http://www.amazon.com/gp/product/B00XTZS4LU