My old Manfrotto carbon 441 has just started to fall apart (I have abused it somewhat) so I decided to return to Gitzo and just bought their GT3530S. So far I'm very impressed with the build quality and ease of use. Their new anti leg rotation and G-loc system is a vast improvement over my old aluminium Studex Performance tripod which is gathering dust in my loft.
The payload for the 3530S is 18kg so there is plenty to spare when using my Ebony and Manfrotto geared head.
The 3530S is part of the Systematic range so does not come with a centre column (which I rarely use) but has an oversized top plate. A column (geared or rapid) can be added as an optional extra.