I plowed through 2 sets of rancho rs9000s on a Jeep TJ a few years ago. They lasted about a year each and then clearly lost their charge and drove like hell. They were a nice shock when I bought them though... just didn't last long. Seems to be the rancho motto: Great out of the box, not a friend of durability. I was a weekend wheeler though, that jeep saw heavy use every 6 days.
Bilstien makes a top notch shock. Fox makes a nice one too. Both of those will last. Fox stuff can all be rebuilt and recharged too.