I recently switched from the very squishy JKS 1.25" that hovered just above and below 1" to the aluminum Savvy that delivers exactly as advertised. Currie is also aluminum, though I don't care for their grill supports. Nylon pucks also work well.Body lifts should be aluminum or nylon pucks that sit on top of the factory rubber mounts. Do not use polyurethane.
Curious if you have any recommendations. I've been considering a body lift on my TJ but 90% of the aftermarket offerings are polyurethane.