CF tripods have three advantages over aluminum - less weight, less vibration (CF damps them better), and easier to use in cold temps (aluminum feels colder because it's a good thermal conductor, which is why my Calphalon cookware is made from it!). But if you can handle the weight, the other two are relatively minor. With a choice between a cheap tripod and none, get none. The Manfrotto aluminum models you're talking about aren't cheap tripods, the quality is good. So, I'd say pick the one you prefer, and go for it!