You will be fine with 3 leg extensions, no need to go to 2, but I'd suggest staying away from 4.
For your purposes, you are on the right track looking at the Systematic tripods.
Look at collapsed length too if you might travel with it.
I am very impressed with the Ries tripod and head that I just purchased, although as a person whose experience is with carbon fiber tripods, the weight of the Ries tripod is noticeable. For short distances, it is fine, and the infinite leg positioning is interesting. I don't know whether it is much heavier than the Gitzo aluminum that you are looking at. As for the head, I think that it is brilliant, and the price very attractive.
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