What comes in pots and makes delicious fruit?

Trees of course...or at least the ones I am looking at. As the sunroom project moves forward with permits and more paperwork my thoughts increasingly turn to, or rather obsess upon the trees I want to fill it with.

I'm rather surprised at how close our overall result is beginning to resemble the plan. Usually things change drastically between the theory and the practice.



But back to the matter at hand, I would like to put 3 across the front (south wall) and one in the east, (left window in the picture).

So that makes a total of 4, but 4 what and from where. Well my search for a local citrus source (or at least in the Northeast) has been fruitless(sorry I couldn't resist). Four Winds Nursery seems like a good shop, anyone have experience to share with them? I tried a couple of the other suggestions that I got, but variety was not what I was looking for.