Just wanted to give an update.
I wound up with two monopods, one that I had ordered and one because it was such a great deal used locally.
Ordered a Sirui P424 as I had seen it locally at a camera store. The one at the store had been shipped missing a part, otherwise I would have bought there. Anyway, it is plenty sturdy, light, and has super thick leg sections. There is a set screw so you can make sure whatever you screw on to the threads stays fastened, as long as the set screw actually hits something. i love the feel of the foam hand grip area as well as the rubbery texture of the twist locks. The spike at the bottom is an added bonus for stability in grass. The little carry case is an added bonus, but the carry strap needs to be able to be adjusted either much longer, or somewhat shorter.
The second one I picked up was the same day the Sirui came in. Manfrotto 681B 3 section monopod with the lever locks. It also came with an arca/swiss style clamp. I have the lever locks on my tripod and find that in certain situations they are better suited for my needs. So now I have a monopod with both styles of legs, and one being aluminim and one CF. The grip area of the 681B is much firmer and dense than the Sirui, but I'm not sure it isn't from age. I did scrub the grip with a brush and hot water which seemed to make the grip a bit more like a sticky rubbery surface so I'm guessing it was never a soft foam. (I've only bought Manfrotto products used, so I don't have a comparison.) like the Sirui, the 681B also has a set screw in the top plate to fasten to a plate or lens foot if everything lines up. Since it was so cheap this one will be my go to "beater" to use when weather may be an issue or I may be banging it around with where I go.
I really wish these two monopods came with the three set screws like tripods do as it would make me feel a lot more comfortable about slinging it over my shoulder. I guess I'm going to have to get used to checking for tightness every time I set up or move. Anyway, both have a big weight rating (both over 30lbs IIRC) and with a camer/lens sitting on top, they both are plenty tall enough for me not to have to bend at all to see the viewfinder. In fact they both are probably a couple inches longer than I need, which is a good thing.
Oh, one last thing... When Sirui places their weights and lengths on the box, the smaller weight number does not correspond with the rating when the monopod is fully extended. that is the weight of the unit itself. LOL (had seen several people say that the weigh limit goes down when extended)