Any suggestion on what brand suspension to go with?

[Skankin]

Using urethane in all the rear joints will cause some aweful binding. I'd just leave the uppers, and get a good set of lowers (that have a spherical bearing to reduce some of the binding).

You won't get the axle hop, so this will allow removal of the quad shocks... which will save you a little money (which you can put towards the lower control arms).