Look in the yellow pages at physical therapists and see if you can find a few who specialize in cycling and bike fit. We have several here in Seattle. That's what I did, and it was a huge help to have a bike fit done by someone who had no vested interest in selling me a particular bike. Then I went bike shopping knowing what I needed in terms of top tube length, etc., and felt pretty comfortable and more in control of what I was picking to buy.