I just recently rebuilt my front and rear suspension with the kits from Centerline (combination of rubber and urethane bushings). What a difference! My shocks were still serviceable, and I swapped the springs from side to side. I wasn't ready for the expense of new springs/shocks at that time, plus I had read all of the threads on springs and was overwhelmed, so the will wait until later. I'm not regretting keeping the original stuff yet.
The front end is very straight-forward, and with the exception of the dangers of spring compression, not too much of a job for a beginner.
The rear, surprisingly, is a lot tricker. The trailing arm bushings are steel-jacketed rubber pressed into a sheet metal sleeve on the control arm. Supporting the arm while pressing the bearing out is very tricky, even for the seasoned massochist such as I... it won't hurt to have some brazing/welding skills for when you push the sleeve through the trailing arm (don't ask how I know). I'm sure there's an easlier way, but I ended up burning out the rubber and using a hacksaw to remove the sleeve. Ugly, but effective, plus it gave me a good reason to repaint the whole thing (the oem paint was in surprisingly good condition).
Now the suspension is beautiful. It's soft enough to be comfortable in daily driving, but it holds up well to spirited driving. I can't see that there would be much advantage to having a stiffer suspension, unless you really have a good reason - I can take speed bumps and RR trax without worry, and can hold a tight line in the twisties.
Just one man's opinion...
[COLOR=Navy][FONT=Comic Sans MS]Geo.
89 Spider Graduate
60 Triumph TR3
73 Triumph GT6 Mk3
03 Mazda MPV dog hauler
91 Nissan King Cab parts hauler[/FONT][/COLOR]