You say that you want a good balance between ride and handling. Does that mean this is going to be a street car only? You need to think hard about what you want out of your Z. Are the roads where you drive most often smooth, or rough? If smooth, you can get away with a more aggressive setup. If they are rough, you might want to stay a bit more conservative. Replacing the bushings takes a lot of time and energy and is not something you want to redo if you don't like the results. OE rubber will ride good and poly will ride poorly, but give crisper steering and handling. Either will be a huge handling improvement over 30 year old bushings. You will trade off ride for sharper handling with poly bushings. My '78 has a very typical setup with Tokico springs, adjustable Tokico dampers, poly bushings throughout, big MSA swaybars, and 16" wheels with 50 series tires. My Z is one of the worst riding cars I've ever driven on our horrible Michigan roads. It takes the smooth roads great and even does well over grainy surfaces, but throw in frost heaves or any sharp bumps and the ride falls apart. The S30's architecture simply can't cope with sharp bumps if equiped with poly bushings. Recession is the key to a good ride over rough roads. Modern suspensions allow the wheels to absorb bumps by receeding rearward as well as travel upward. Poly bushings hold the suspension rigid longitudinally which sends the shock of a bump directly into the body of the S30. As soon as I exit Michigan and cross into Ohio where the roads are maintained better, my Z rides just fine and handles the backroads beautifully. When I finally get it to a track, I'm sure I will appreciate my setup even more. If I just drove it as a daily driver though and didn't want that last little bit of handling, I would skip the poly bushings and replace everything with new OE rubber. I would keep the springs and dampers though. I like the way the car rides over large undulations and how it corners flat. It also looks great lowered an inch.