@Lefty
Whilst my 3LT tripod is ok, I wouldn't be rushing to buy another 3LT product, I don't use my that often and find it clunky when I do, but I had a friend whose 3LT Carbon tripod just came apart (apparently a Carbon Fibre Bonding Issue), so that doesn't inspire confidence.
Given what you want to do, and how many years you want it to last, I think I'd be looking at a Gitzo (new or secondhand), I know they are expensive but they do meet all your requirements. Just have to disturb those moths at the bottom of your wallet!
The Gitzo seems inevitable doesn't it!
Seriously though, I think my current plan is to try and repair the Manfrotto. I think it comes with a lifetime warranty and that ring should not have fallen off. I'll see if I can blag the part for free...
No moths at the bottom of Amar's wallet. He buys a completely new camera system every 18 months!
That's actually surprisingly accurate! Although that would mean I've still got until the end of the year with the Z7
Lefty