I will say I put so far $1300 into my truck total for the lift and SAS, axl was free. Using stock steering linkage and didnt have to buy a drop pitman arm. The costly part and was my saftey factor was my long arms,didnt got chap on them, they costed me over $600 and are worth it.
I dont recommend going from D35 TTB to D30 SAS, its a downgrade but I had a worn out D28 that had to go and my D30 was put in my lap and thought, why not.
If you really want to go SAS, go to a D44 either narrow one (high pinion) or go EB (low pinion) or go full width but then you will have to go full width in the rear. But going D44 means your lug size will change.
Theres alot to consider when doing something like this. I did a year of research before I did my SAS, making sure that I didnt miss a thing. Took me 3 weeks from start to finish on my SAS alone working on it 5 hours a day. My rear took 3 days. I knew what I ned and what I wanted when doing this. I will say the shocks total on the truck costed me around $200.
But what matters the most is what you plan to do with your truck, that determines what you will need to do and what set-up to go with.