Well since weight is the driver, you may want to reconsider CF, although Induro does advertise some aluminum models with specs that exceed the capability of the 3021 while cutting the weight by 30% or 40% (off the top of my head). I have no experience with them though.
If you look again at CF and decide Gitzo is a dollar sign too far, then from a weight and capability perspective, I'd take a look at Feisol. They seem to be lighter than Induro for the same general capability (as much as you can tell from listed specs, as Neil has pointed out from the extensive testing he has done). The Feisol brand has a good reputation and my experience with my Feisol gear is positive.