I am also 6'5" and have had the same problem when I want to stand. A lot of the time I sit at a high stool just to be comfortable.
I use a Quicklock when I do stand, but it isn't quite as stable as I would prefer, although I haven't tried the one Donny pictured.
I have a lot of parts for the old Ultimate Support stands that are made of tubing, elbows, collars, etc. A great stand can be made of these, but it isn't the quickest to assemble and disassemble so I leave it at my "sit-down" job.