disease resistant apple trees

What varieties of apple trees do you have that you find are the most disease resistant to things like scab, rust, fire blight.  Where did you get these varieties?  

I have a few young trees.  The Ruby Mac seems to be doing the best so far for disease resistance, though I don't know if that will always be the case.


Thanks


Steve in PA

Here in Washington State, my experience has shown that Liberty, Freedom, Dolgo crabapple, Gravenstein, and Enterprise have all been good choices. Winesap apples too, and cider apples in general that I've seen.

I concur with James' suggestion of Liberty. It's been carefree and reliable for us.