Judging by your stated needs, there is no reason to go so custom on the suspension. Sure, it would be cool but not cost, nor time-effective. I would sell all that stuff you have and get S30 parts as others have suggested. You want something fun to drive around on the street, and for that I think you will be satisfied with stiffer springs, matching shocks (as John points out, this is key), poly bushings, and maybe larger ARBs. This will be much less time and energy intensive and definitely cheaper than going a fully custom route. If you feel like building something, take a look at all the threads on building control arms and coil-overs. This will give your suspension some adjustability, but I just don't see a reason for it from the intended use of the car.
There is absolutely no need to get 300ZX brakes and an R230 rear end for what you're doing. Again, it would be cool but not necessary. Stick with a simpler plan and you'll have the car on the road much quicker so that you can enjoy it!
As Stepan also pointed out, there is no such thing as a "perfect" suspension. Suspension design always involves compromises. Ride quality and road handling have an inverse relationship, mostly dictated by the dampers.