From what I can see, the boxed PC/Mac version is being offered for $99.99, while the separate Mac and PC downloads are each $80.58. The original post seemed to say that the boxed version was also $80, in which case I must have missed it.
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The 234 was a great advice, and I use it with the C-10 clamp.Yes, that is strange. Maybe they are just using up old stock, since I imagine these products sell in much lower numbers than the bare heads. While looking for the 234, I found both wall mount and table mount Manfrotto brackets at Adorama (models 356 and 355 respectively). I was contemplating whether I could cannibalize one of these for the head, since it appears to be simply bolted on to the bracket.
I don't know why Manfrotto stopped selling the plain clamp given they have so many products (234RC, window mounts, wall mounts, etc.) based on it.
I have been using a Benro DJ90 monopod head with good success. My heaviest lens is 70-200f4L on a 5D3, so not as heavy as what the OP has. I can't find it on the Benro website anymore, I bought mine at Vistek (in Canada).The only Benro model B&H sells now is the DJ80, which seems to come with Benro's own plate design. I wonder why these manufacturers are discontinuing their bare and Arca-compatible heads? I suppose they want to lock you into their proprietary QR system, although I recall seeing on CR that Manfrotto is going to start offering more Arca-style products.
When our MH-01 Monopod Head is more than you need, consider the Manfrotto 234 Tilt Head (formerly known as the Manfrotto 3232). Really Right Stuff no longer sells this head, but we recommended it for years. Great for light loads, this simple and inexpensive tilt head is only rated for 5.5 pounds. Mount our B2-Pro clamp directly to the Manfrotto head and you have a reasonably robust tilt head with quick-release capabilties.
Looking at your original post I assume you are thinking of the different orientation of QR plates on your cameras and larger lenses. If you do the same as me - I align my QR plates along the center-line of my long lenses (equipped with lens feet) and at 90 degrees on the cameras. If this is the case then - no the Sirui does not accommodate this without the use of tools.
Instead of changing the monopod head orientation, change the orientation of camera's attachment point. The RRS B2-mAS clamp ($60) has a bottom dovetail at 90° to the clamp. You could connect it to the bottom plate or the upright part of the L-bracket, as needed, to connect the body to a fore-aft monopod clamp.
The rule still works, but film had a wider tolerance for missing the ideal exposure.
Thus, ASA 100 became ASA200. Really Confusing, but the wide latitude allowed by film allowed this to happen without overexposing. That's why absolute accuracy really wasn't a big deal.