I have been very satisfied with the Rancho kit on my truck. The kit consisted of 2-in spacers and new lower control arms to correct the caster of the axle. Rancho specifies using a longer front shock and, as they say on TV, they're "sold separately". From memory, the susp. kit was around $400 in 1999 when I bought.
Something to note. I read a post where someone made a great point about the front axle being off center as a by-product of the lift - i. e. track bar needs to be lowered @ the frame (or new adjustable track bar) in order to bring axle back to center. Have not had the time yet, but intend to do some careful measuring & see how much mine's off center - no time yet. Truck drives great regardless... .
Good luck