For me it started and ended at Cameraland. I tried looking myself but was just overwhelmed by how many there were.
So I called them, they had a sale over summer, and I got a Sirui (ET1006?). If you're hung up on Manfrotto, forget about it. Sirui is on par with and sometimes better than Manfrotto, they're both top line mfg.'s. I basically told them what I needed it to do --hold a heavy LRF/spotting scope setup, be used in the prone or standing, not be too heavy, be able to support more weight. I got one that goes down to 8" prone without the use of horizontal arms or gimmicks, it' just goes that flat. Supports 27lbs., more than some dedicated rifle tripods. Super happy with it and it only cost $135 or so shipped.
They make a carbon fiber model for about $200 more. It's nice, but I'm not humping it for miles so I figure it won't matter and the weight savings isn't THAT much. I'm happy with this one, zero complaints. Sure glad Cameraland knows their shit because I doubt I'd ever have found this one on my own.
Here it is in the prone setup, the eyepiece is about 9" off the floor.
Here it is in the seated position. It has two center posts, a long one for standing and a short one. I use the short one for all but standing. I got the cheapest ball head that came with it since I didn't know enough to know what I needed. But hindsight I'd probably prefer a pistol grip ball head for convenience. Other than that, I'm happy and may get another just like it for a rifle since it supports 27lbs.