Sugar, after you leave the newbie 1 ally space, there is no real point in staying low ally, as I find the ally band pretty wide. Also there are a lot of folks just hitting the attack button.
However, I do find it convenient to hang around between 20-45 ally space since you do pick up a lot of ally requests. I have around 150 pending, I intend to use it all once I start approaching level 50 :)
Still no nukes..