I have run Old Man Emu, Dobinson, EFS and Tough Dog coils in my Safari's, and have gone back to my original 3" Dobinsons.
The EFS were a very nice riding coils, but I didn't like the price of their shocks, so ran Pro Comps from Oz. The OME coils I didn't like at all, and the Tough Dogs were far too stiff. The 3" Dobinsons are now in my GU, and are still going well, and I run OME L series shocks, which seems to be a good combination at the moment, although the shocks are limiting my travel.
A lot of people find that the bodies on the Safari can crack if using body lifts, and will take the lift blocks out because of this. The only reason I was looking at the BL is so I could run 80 series front shocks to give extra flex in the front, which would require lifting the front shock mount by 40mm or so, but I will do it without the lift I think, just cutting the body to access the top of the shock.
It all depends on what driving you intend to do, but most people do the lift/tyres first, with the turbo/difflocks later.
If going 3" or higher, I would not use bushes for castor correction, this is a cheap way of doing it, and usually by people who are inexperienced with modding safari's. Drop boxes is by far the most economical way when looking at the benefits, and although it drops ground clearance, there is a lot more to get hung up on before the boxes will become a hassle. Mine will drag. but have never been the reason for being stuck.
Also, when lifting a SWB and needing to get rid of driveline vibes, I find the best way to help is getting longer/stronger lower trailing arms, as this not only helps reduce the vibes, it also gets rid of a weak spot that can cause serious problems if badly damaged.
Sorry for waffling on
Just my thoughts anyway.
Dave