Have you actually seen first-hand any B's (or small C's) first hand yet? I'm not talking about the specific model you're thinking about, but _any_. Seems to me that that's your next logical step. Get in with the SO, close the doors, sit and move around. Stay awhile.
Do be aware that a _lot_ of salesdroids will show you a 'B+'/C when you specifically ask if you can can see a Class B. Happened to me even before the 'B+' term was made up. Partly they don't know the difference, mostly they want you to buy what they have on the lot, right now. If you've got a smart phone, take it and do some on-the-spot research on whatever you're being shown.
Jim, "I tried to microwave instant coffee, and went back in time."