I'll have to disagree about P-S-T offering poor quality bushings. I have their front-end rebuild kit, and am very happy with it. In fact, my friend's 94' Z28 has their kit as well. The right lower balljoint had a crack in the boot after 5-years of use. He called them w/o an original receipt, but they still sent him FOUR NEW balljoints for free. IMO, that is great customer service. They warranty their products for 20-years and it's a "No Questions Asked" deal. I would also recommend Pro-Thane.
P.S.-You also should take in to consideration that any bushing will crack if exposed to harsh conditions---Road salt, extreme cold, and etc. after a few years.