your bushing will make a big diff. personally for what its worth, im no wrencher or have much lift exp but i did finally take the plunge on making an actual purchase after 2yrs of hummin n hawin quite a bit of research, vids etc. 2yrs ago everyone was all about the bilsteins but i find these days some who have moved on to something else, kinda diss them now a bit. australia drives the 4x4 mkt, old man emu & Dobinsons as you mentioned i dont think you can wrong with either. both products explain the load height/lift of their springs specifically for our 3rd gen rigs. There is also the '99 talls from toyota which is probably only a 1inch.
as mentioned above i think a popular ome spring option are the 906 for moderate lift. 2". before you take your plunge take some serious thot to weight, this is what really should determine your choice. bumpers etc. many seem to go with billy & 906 but i could nvr understand why peeps werent pairing ome springs with ome shocks? i believe billys give height adjustments with their perches i think.
i was previously running stock 99talls with 4600 billys, big upgrade from original tired 20yr plus shocks but i really hated the ride, too stiff.
i went with ome890s and also their "soft valving" rear shocks cause i was really concerned with 2 things .. going with 890s being more lift & potentially be a bit stiffer(i think thats illogical) but i really wanted a plusher ride. someone on these forums i think had this set up & described it as "cadillac" like. so far so good but its only been a couple wks & few miles so im not giving a stamp of approval on anything yet.
id decided on 890s because of loaded weight on trips etc, occasional towing also someone had complained about 906 sag somewhere. currently im slightly concerned i mayve over done it on the 890s but whatever i know theyll settle some & i know im just being picky, whats an inch .. nothing.
also a forum member here has a nice how to vid on 906s and billys lift on u tube, simple "speedys garage 3rd gen" should find it easy enough .. youll get an idea of height looks ride etc. Timmys is great also!!
another u tube recommend is "tinkerers adventures" he has great vids on explaining on whys, geometry and physics of lifts/suspensions etc
a bit all over the place but hope it helps in some way ..