This is what we have on our '01 ST now and I really like the setup. It's a stable, comfortable ride with excellent road feel.
Explorer Express rear stabilizer/anti-sway bar w/ greasable bushings from ToddZ, and upgraded '03-'05 factory end links with poly bushings;
4x4 Front OEM stabilizer/anti-sway bar, on 4x2, and upgraded '03-'05 factory end links with poly bushings;
Roadmaster Active Suspension on the leaf springs;
Tokico Trek Master R/T shocks (front and rear);
Bridgestone Dueler H/L Alenza tires, 33 psi front & 35 psi rear