We have decided to grow grapefruit, plums and possibly peaches. Where do you all go for a good selection of such trees?

Contact your county agricultural extension. They will be able to help you get the correct fruit trees. Most county extensions have an annual fruit tree sale in early spring and most have a class before the sale explaining the differences in the trees for sale.
They will only have trees that do good in your area. To understand why this is important to you. Go to this site.

http://sandybarnursery.com/tips_on_choo ... rees04.htm

Thank you very much!