Scarface,
It is my opinion, that you can achieve what you want to do with a good 4 link system and regular coils/ shocks.
It is also my opinion that multi rate coil-overs and air shocks are definately the big pimpin bling that I would love to have 
. But I personaly would throw that money at some disk brakes at the wheels, espicaly if I were going to try to run 2.5 Rocks on the street. BTW: Steven at Low Country 4x4 can hook you up with some a little cheaper than others.
But that is just MY opinion.....
