Get the correct lift kit correct springs an you wont need any spacers, your KJ will thank you for it... and its only my opinion but the Stock springs are caca anyway and so are the struts/shocks. in any event it is your KJ so you can do whatever you think is good.
So if you want conduit nuts, use 3 on each side in the front and 3 isolators in the rear (any more in the rear you could pop out your spring)....and call it a day. Depending how your KJ was built since they were all built different you will maintain the whatever lift you get ( cant comment on that either since they are all different) for a while, and then you will notice that the ride will change, and even though some will disagree you will start to loose your hight. If you want it to last, and you wheel it OME HD's all around, but I undrstand its expensive. We all want our KJ's lifted, but at the end of it all doing the right thing, and doing it right are two different options. good luck and post a few pictures when its done..