Neil, that was intense. ;>=
You're quite correct as far as finding your positions goes, but you don't have to barre so much, ya know--your fingers will thank you ever so much if you learn those inversions as four-strings-played chords, and there are of course lots more ways to play them!
Four-string chords with no open strings are of course completely mobile up and down the neck, and that's really handy.
I really like Arnie Berles "Book Of Modern Chords"--showed me some swell ways to do stuff that I never would have come up with intuitively.
Bill