I tested a few tripods since October.
The Manfrotto 509HD is not bad but found a few problems with the test ones.
Loose parts major turn-off.
We have a Sachtler V15SB and S20 at work, major drool factor there but the cost way up there.
I tested these Sacthler knock-offs from SECCED.
They were not too bad and has some back story that the tech is from older Sachtler.
A decent one that holds 27lbs was 2300 USD last time I checked.
Currently using a really old Miller 25 with al-sticks.
Its free to use I cant complain
When I had the BMCC in my scopes, I was going to get the Sachtler FSB8T but that only holds 20lbs.
Now Im hearing you need more than that if your are a serious Cinema user.