@ awfulwaffle: thanks for the input and link.
@ Bandera: Yes that is absolutely my intent. I will also have the bike shop build the bike I buy online when it arrives, and dial in the fit for me. I intend to be honest about my aims from the moment I talk to the salesperson at the bike shop. Are you suggesting that this is unethical? I imagine that people test ride bikes all the time that they don't intend to buy.