Ask your LBS if they can set up several different bikes on trainers. That will at least give you a basic feel for fit, before you try one on the road. You will notice that some bikes feel "off" almost immediately, and that may help in whittling down the possibilities. And try this with as many LBS as you can.

Once you get down to 2 or 3 you like, call around and see which shops have them in your size, and which ones will let you take them for a test. The bike manufacturers usually have a list of dealers on their web site, so just start calling them. I have a dozen bike shops in my area, yet still had to travel quite a ways from home to find a bike that fit, but it was worth it.

Good luck in your search!