I'm Aquarius too, i dont think the water element means much Boodizm. We're supposed to be independant, intellectual, innovative etc, interestingly you are either very social and friendly or aloof and distant, so i spose that caters for Social phobic Aquarians eh?
I don't think u can divide the whole world into twelve categories of personalities. What differentiate you are also your moon sign which say more about how you relate to people, your signs in venus (ur love sign), mars (your natural urge), jupitor (how you come across, communicate) and so on. And all of these depend on your birth day and year.
My moon sign is sagittarius, venus in aries, mars in aries, jupitor in aquarius...
Don't forget there's also Chinese astrology (i'm a rat by the way), palm reading and numerology.
sorry about the lecture yea i'm into that as you can tell hehe