Here are two suggestions:

Eagle Creek Adventure Hybrid 22". It has a carbon-fiber rear and a ballistic nylon front. Weighs 6.25 lbs. Currently on sale at Luggagebase.

Briggs & Riley 22" Domestic Carry-on Expandable Upright. Heavier at just under 9 lbs. and almost twice the cost of the Eagle Creek bag, but a proven road warrior and still lighter than the Stealth.

Both are also backed by lifetime guarantees; B & R even covers damage inflicted by the airlines.