Can't go far wrong with Plush, it is worth paying the extra for it over other places as you really do get a quality kit, the chassis notch.
I had mine done in April, and took it in for its 500 mile service (not a regular thing, just to make sure it's run in properly) and the guys took some extra height off the rear helpers to get a straight drop, and FOC too.
He mainly uses Airlift products, and I have nothing but praise for mine.