My plan is to go with the Supreme Suspension (SS) spacers. RC, 3.5" struts, RC rear shocks and control arms. I agree, the SS spacer looks better. The center piece of the spacer is a smaller guage than the ReadyLift, but otherwise I like how the SS one is welded right around with no seems for water and crud to get in (I live in the northeast).
Here's what's odd, on the SS website, I could not see this spacer, but it was on Amazon and sold by SS. I called SS and they found my Amazon order. He did confirm it would fit my truck. I asked why they only have bottom spacers on their site instead of also offering this one. They guy gave some odd answer saying "we like to offer different products in different places"