Bilstein can rebuild shocks too. So if you can find the ones you want used but worn out it’s worth asking them about rebuild. They can also tailor the valving in some of their models to match your needs.
Poly bushings will be firmer and usually a little easier to install. But you will have to replace them more often. The factory style rubber ones will last for years and years without issue.
Believe BTB and SOR off “grocery getter” spring packages. Basically stock ride height springs. Rockauto used to list stock springs from some generic spring mfg. No idea how good or bad they are