Question for the more experienced runners: I ended up with my current running shoe – Brooks Ghost -- because I went to a running store, the guy watched me run on a treadmill, talked to be about mileage and surfaces, and then had me try on the Ghost, which felt fine (I think . . . I don’t have much basis for comparison). They had a reasonable selection of shoes, but were lacking some shoes like Newtons. Do you have a better way of finding out which shoe is best for me? Or is this the way to go?