With apples, fungal issues can arise from poor airflow; just something to take into consideration. Also remember that rabbits love young apple tree bark, so protect the base as soon as it's planted, they can kill a tree fast.
If you plan on using them as a screen, plant them so their mature canopies have enough space (no reason for them to shade each other, especially when different fruit trees can grow at different rates).
If you're looking for speed......mulberry! I don't know if I would plant another mulberry by my house, but I love the big adult tree out by the tool shed! They are messy but so is the choke cherry, and I believe they are slower growing.
For apple trees....I can't say enough about Tom Brown at Apple Search:
http://www.applesearch.org/buy.html I have young 3 trees from him, recently planted, and they are doing great. Excellent price, even with shipping.