good adjustable shocks?

[botboy]

Going to be doing some suspension upgrades to my truck once the bodywork is done (cab corners and rockers, eventually paint). Would like to have adjustable shocks, not the air-inflatable kind but the ones with dials or selectors so that you can "tune-in" for the type of driving or load you will be moving.

Anyone have experience positive/negative with these? What brand/models did you buy? Did you put them on all four corners or just fronts/backs?

I would like to avoid airbags because they are unreliable IMHO and the compressor/tank/valves take up a lot of space.