I like a 1-4x20, and a 2-7x33, and a 3-9x40. I don't mind a 6x40, but it sure is nice to be able to turn down the zoom until I need it.
And something like a 6-18x something would be another nice choice depending on the particular situation or just for range work/fun. .

A 4-12x40 is something I should try. It might make the most sense for a next and last step up above the 2-7.