I want a decent slider that will hold the weight of a Nikon D800/810 and vertical grip with a 70-200 mounted on a Manfrotto head with a leveling base.
Then you won't be happy with any $200 slider.
I'd suggest you do a little more research on some of the DV sites, dvinfo.net in particular is one with long time pros contributing useful information.
Kessler Crane is a great a company and a good reference for quality at a reasonable price.
I have all the RRS ball heads, pano gear and lot more but I don't think their slider is a good value.