Personaly I wudnt use extended shackles, they put added force on your suspension leaves and force them down eventualy they will staft poainting down and you will find your SJ is probably lower han when you started. Something that seems all the rage at the min are Rough countr ad-a-leavs they are imported by
llama4x4 and are reasonably priced. they also do reli good quality braded brake lines, and shocks!
I went down a completly different route. I put a set of suzuki carrry/bedford rascal springs on the back, then put my original rear springs on the front with some missing link shackles. For shock absorbers i have put astra mrk1/2 rear shocks on the front £18 inc p+p for both and on the rear i am putting landrover series 2/3 rears £26.99 inc p+p for both both need very basic mods to fit. My only consern is that the rear is going to be VERY stiff as the springs are brand new and the shocks are designed for a much heavier vehicle. but they should soften up or i can change my shocks, all of this has given me a 2" lift, but a fair bit of articulation, especialy on the front. but more importantly allow me to fit my 30" machos
Other mods you may want to consider, something to cover your wheels/tyres when you have put your spacers on, as you look down the side of your sj onto the tyres you aren't allowed to see any tread, if you get pulled with exposed tyres and they decide to do you its 3 points EACH!!!!! abit extreme but would result in bye bye license! a comon solution to this is get a bin or something made of reasonably stiff plastic cut it into strips and screw or rivit to the underside of your arches with it exposed enough to cover the tyres, or put some landrover defender arches on, with abit of modification with the jigsaw they fit a treat and look reli good which is the route i will eventualy go down. or if it doesnt al ready you could get some wider plastic arches and stick them on. (let me know if you choose this route(must install a wink smilie))
Hope thats not to much to take in in one go!
Dan