First off BookBoy, your woman sounds like a great catch. Someone who understands your desires and is willing to play along.
I bought an EXP and all of my other kites so far have been bought used in nothing less than very good condition. Most Rev fliers take excellent care of their kites. I will say that I rarely use my EXP now. I save it for inclement weather or as a loaner. I like the B series because of the better sail, better bridle and color options.
I've only been flying Rev's for a year and a half so what I can do with a B series probably hasn't even scratched the surface. Having an alternate frame is extremely important for varying conditions as well as having a backup, but I haven't broken a stick yet.
If you're willing to wait until Bazzer comes back from sabbatical to build you a B-pro or buy one from a dealer, then by all means, but the improvements are more for advanced fliers and long term wear than specifically increased performance that newbies would notice. At least as it's been explained to me.
I think you would be very happy to own a B series and it could save you a few dollars. SparkieRob is right. See if you can network to find a flier or dealer that might let you fly or borrow. Kiter's try to keep everything above board because it's such a small community. Reputations are important.
Good luck and great winds. Post pictures of your baby when you get her.