Rancho RS5000X shocks ride the best of any "off the shelf" shock in my opinion. I've tried Bilstein 5100s, Fox, OME, and Rancho RS5000X, and the Ranchos are not only the cheapest, but ride the smoothest.
I absolutely hated my rancho shocks. They were very stiff and provided a very rough ride. They were one of the main reasons I upgraded my lift kit to teraflex 2.5 with shocks.
The gearheads in my area are generally in agreement that they are great for heavy trucks, but if you want a comfortable ride avoid them. I wasn't on these forums when I got them last year, but I did get the suggestion from the internet. I kept them on there about seven months before I got fed up.
Rancho RS9000 work well and have a street price of less than $100 per shock. They're adjustable so you can tailor the ride to your preference. The biggest downfall I see is the finish. Most folks recommend a couple of coats of clear over the factory finish as it's lacking, especially around welds and the adjuster on the RS9000
Interesting you say that! I've owned Bilstein 5100s, Fox IFPs, OME Nitrocharger Sports, Rough Country, and Rancho RS5000Xs. My favorite riding of the entire bunch would be the Rancho RS5000X shocks by a long shot.
The only thing I had that rode better would be custom tuned Fox 2.0 smooth body shocks, but those were also $300 a shock and a custom tune on top of that, so it's to be expected.