Thanks for replying, Dave. It's good to hear from you and I very much hope this site will become as successful as DG!!
My research last week brought me to the conclusion that these would be the best trees: Fuyu (6-7', most popular), Jiro (12', mid-season, self-fertile, non-astringent), and Giombo (20', early, Astringent, self-fertile, very sweet).
Other recommended trees are: Maru, Gailey (mid, astringent), and Hachiya (mid, astringent), Saijo (early, astringent, very sweet).
I think the grafting is done so they will be more hardy in colder climates. I live in a very windy area where the summer temps are over 100 and winter temps can dip to the low teens. So, I thought it might be well to look for a more hardy tree and have the best chance it would thrive. Actually, I'd be glad to get two or three different cultivars.