Talk to a topper dealer. You'll have to go through them anyhow, so you might as well make them earn it. I had a Leer on my '07 and it looked great, but Leer quality in some of the mechanical components (hinges and latches) wasn't that great.
I put an ARE on my '17 - about $2k. If you have utilitrac must use special bracket that attaches to tracs (regular brackets will not go around the trac). - as far as I know the dealer got brackets from ARE.
4are.com - I bought CX series with standard side window sliders, front window slider and fold down, lined, dual rear locks, battery operated light, and had roof rack tracks only installed in case I ever want a roof rack.