At present I'm using a common type of "flat bar," a Bontrager crowbar which has a 25mm rise and about 6-7 degrees of sweep. Used in combination with an adjustable stem which raised the bar at least another 1.5" from it's original position.

I wanted to share pics of my comfy grips and bar-ends. I have inexpensive knockoffs of Ergon grips and Cane Creek bar ends. The grips are $10 Avenir (Raleigh) comfort grips, which are softer and contoured somewhat different than the Ergons. They fit perfectly into my hands and the extension in the palm area allows me to rest my palms directly onto the grips and take pressure off of my troublesome thumb joints.

The bar ends are from "Tranz-X" and are sold under other brand names. Paid $20. They are synthentic rubber (Kraton) coated carbon-fiber. Lightweight at 148 grams. Nicely contoured and also fit right into my hands.

The combination gives me three primary hand positions, one on the grips, one with my hands moved partially over the bar ends (resting the outside of my palms on the flat area of the bar ends) and partially over the grips, and then with my hands turned with the bar ends fitted into my palms. All three are very comfortable.