Six feet may be a little close. How about growing espaliered? Dwarf apples in a windy area will usually need to be permanently staked anyway. Al

Yeah I don't really know about espaliered apples either? Do you know where I might find some pictures? I figured I would need to stake it for a while, so permanently staked wouldn't be too much of an issue. I just wish I really knew how big they will get. Even if I see pictures, its hard to tell there size unless there is something to compare it too.

Does anyone have any pictures of mature dwarf or espaliered apple trees?

These are about 20 years old on a dwarfing interstem.
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You definately could put in a dwarfing tree or two in that space with southern exposure in your area. I would recommend doing a little research on what types grow well in your area - if you're in Oklahoma you might want to choose a tried and true southern variety. We've purchased dozens of trees from BigHorseCreekFarm.com and they've done well for us (we're border zone 5 to 6 in Kansas). BHCF specializes in southern apples and they have hundreds to choose from and a great website full of info. We will also be selling bench grafts and scion wood in the future - Wagonwheelorchard.com Hope that helps, Rick