The Feisol tripods are probably the lightest for a given upper leg diameter. The 28mm Feisol legs weigh about the same as a Series 1 Gitzo.
In general, 28mm legs are good for up to 200mm and I think a Gitzo Series 1, at 24mm, is too thin.
I tested a Feisol 3442 against my much older Series 2 Gitzo G1228. I found it comparable, and in some ways performed marginally better in certain controlled tests. I would expect the 3 section Feisol to perform a bit better since fewer leg collars are better.
The Feisol T models have legs that fold over and also have smaller diameter mounts. The 3442/3342 models have the larger flat top mounts. I suspect the fold over travelers might not perform quite as well but I've never handled one. Not to say they won't do the job (can;t speak with experience on that) but on a relative basis.
Feisol has a very good reputation for supporting their products, probably the best in the industry.
For what you want (weight a top priority) the Feisol may be a very good choice or the best choice.