I recently bought a Diat CM-294A carbon fibre tripod (see link below) and it is superb. It holds my Canon 7D and Sigma 150-500 rock solid.
I am just 6' tall and with the Giottos ball head, my camera is at a perfect level without the centre column extended, in fact I have removed the column as I can see no situation when it will be required.
Ignore the fact that it is made in China, the build and material quality is as good as any other tripod I viewed.
http://www.diat.cc/en/displayproduct...roID=101379512