Oh wow! You are awesome Miriam!
I think I will go ahead and conduct a study on this anyway, this presents a perfect opportunity as i have two clean and fresh slates to work with, one, for a client which I will do varied to be perfectly safe, and one for our own redesigned website to be launched soon, which I can take all the risk for and just do one single copy and see and compare the effects. Although it will be apples vs oranges due to totally different industries, but I doubt one ever gets to compare the two routes for the same type of business unless you are lucky enough (or shady enough) to have access to competing clients data...
I really do appreciate your post and time spent, deserves all the thumbs ups I can give it and may well get me to do this albeit somewhat flawed study.
Not sure if I will have the time to setup a fully controlled study... but it will be nice to get some idea of how this works. Hopefully i can report back soon in a youmoz post. Thanks again