Zeta is really good. I've heard mixed things about ZZ and haven't seen it myself.
Turn A is a show that I have been watching and enjoying quite a bit. Hero legends almost has the whole series out in fan sub. Don't let the mechanical designs throw you there is a great story in this show. Also The turn A design tends to grow on some people. I wasn't to sure about it at first, but now I just think it looks cool. Even ordered a model kit of it.
Also one that is not on your list Char's Counterattack is a great movie and wraps up the whole Char/Amuro rivalry. It is fun to watch, and the mechanical designs are just cool. The soundtrack is also very good. However you should probably watch Zeta before watching this because it makes more sense, and helps (at least for me) clarify some of the events that cause char to do what he does.