Look at it this way. It is going to cost you somewhere in the neighborhood of $60-$80.00 to drive out there at $2.00+ per gallon, not to mention killing a whole day. Secondly, if you need a reburn for any reason, you are going to do one of two things, drive out there again and kill a whole day or you are going to use a local dyno, send the chip back (if you use a chip) and then re-dyno to make sure the chip works.
I understand what you are saying about Kauffmans. He works extrememly cheap, and he has a good reputation. Do I think you'll get a better tune with JD's, I think so, but that is my feeling based on what I have seen coming out of both shops.
Dave @ Kauffmans is a very competent tuner, so I don't want to sell him short, I just feel JD's is better. This is why when I lived in Philly, other then Larocca's, JD's was my tuner of choice.