I currently have a Vanguard AT 263(?) tripod in aluminium, but I am looking for a carbon tripod with similar features, like a centre column that can be used horizontally, and will take the weight of my Canon 60D with the 100-400 lens as well as a flash unit.
The Vangaurd barely copes with this weight and I have to let the tripod settle for a few seconds before I can take the shot, otherwise it is still shaking.
I need the variable angle column as I do a lot of product and macro shots and this feature is very handy for me.

I was thinking about the Manfrotto 055CX3 Pro and was wondering if anyone out there is using one and what they thought of it using a big lens.

I'm not tied to Manfrotto, so any suggestions would be welcome.
I don't mind paying up to say $600 for it without a head, as long as it is light weight, strong, and will last for 10 years or so.

What do you guys suggest?