a body lift is around 350-400 depending on brand and all. a body lift, lifts the cab and bed off of the frame allowing space for bigger tires while keeping the factory ride. a suspension lift, lifts the whole truck(frame,cab, and bed) through the suspension parts(coil springs, struts, torsion bars, leaf springs, shocks, lift blocks,etc). each suspension kit is different for each truck model. some rams use coil springs in the front for suspension, and some use torsion bars. for most trucks except for the 4th gen rams to my knowledge use leaf springs for the rear suspension. if you are wanting a lift and dont really want to sacrafice ride, a body lift is probably the way to go. keep in mind though without a leveling kit or cranking on the torsion bars a body lift will not level out your truck.