If your not on IH8MUD, I would highly recommend joining and spending time in the 100 series section. tons of answers there. There are a ton of ways to get to a lift as some have indicated above. There are a several shock options now as well as one or two others selling diff drops. However, I would just get the Slee diff drop if you are going to get one. Some run it some dont. 2000UZJ pushes his harder without a diff drop than 90% of those running one. But, you have to make the choice.
Absoute lowest cost.... crank your t-bars and install the Man-A-Fre 30mm spacers for the 80 series.
http://man-a-fre.com/pa/80seriescoilspringspacers.htm
$40 and call it a day.
for the cv band clamps:
http://forum.ih8mud.com/pfran-leds/521348-100-series-cv-boot-clamps-bands-mcmaster-carr.html
The OEM's suck.
Now, with all that is above, that is the bare minimum to lift your rig. Newer shocks, springs and all that will improve ride quality over the stock ride... but, will never be as smooth or soft as to what you are on right now. It will become more truck like in feel. I have learned through a lot of trial and error that higher is not better. Through talking with other more experienced 100 owners and my own experiments I have found a couple things:
1 - you will want about 1" rake front to back (I.e. - the front needs to be lower than the back by about 1"). Some go less than this and they are ok with it. It is a personal feel and every one has different feelings on what is ok. But the way the truck was designed, you will want some rack for best handling.
2 - The highest I will go now is about 20.5" from center of hub to edge of wheel well. It just rides better to me and I have been as high as 22"....Yep I lowered my truck almost 1.5" for ride quality. But, I also have aftermarket UCA's that give me more droop and more range to lift.
3 - Lift... no matter how high you decide to go... Make sure you maintain at least 60mm of droop in the front for safe handling.
Good luck! I wish I had a cruiser when I was 16...