The AC Articulator kit might be the best bang for the buck out there.
Everyone I know with an AC SL kit (Not the Articulator, too new...) has been happy with it.
The SLR kit has better front wheel travel I think, but its the only one (We are talking about 3" lifts here...).
The Bils I have at least are great, and no one has complained about Bils, or Rancho's Shocks to me...other shocks, like Calmini's...yeah.
I ~ have 1/2 SLR and 1/2 Calmini suspension...I have the parts I liked from each. I have no AC suspension...unless I count the revolver shackles...which are still in my garage.
Frankly, other than the Rancho SL (Not the shocks...they're popular...), all the available lift kits seem to work fine...and hold up OK....and its not that the Rancho SL's fall apart, its just people didn't like the lack of ariculation, the 2.5" lift instead of 3", the short AAL, etc.
I did the SLR UCA's to get more downtravel and the diff drop kit to relieve resultant drooped CV angles.
I like survivability.