there are a million threads on SL about this topic. The best air ride for me, might not be the best air ride for you. it all depends on what your looking for, and I did it all...f, b, ss, and i have 2 huge compressors and a nice shinny switch box.
my front bags are Airlift, the rear bags are Slams w/ fbi brackets), (2) 2 gallon tanks (mounted under the front seats), (2) air Zenieth compressors, and (3) check valves. Don't ask me about my line and fittings, b/c nobody approves.... but its flexable, and i haven't had a single problem with it!