Biggest difference on a single mod has to be the poly diff mount, but the other parts listed all combine to great effect, I would not lower more than 1" from std, depending on which model a thicker rear arb makes a huge difference, the std 14mm 3 door rear arb isn't worth a shit, strut braces defo needed on the "weebles" machine, ie they have more wobble than a weeble, if sticking just front on these can lead to inner wings cracking as I had with my mk1 sierra.
Original 3 door hubs are a good upgrade though on sapphy but can make the car twitchy, which some don't like.
tabetha