Paging REF. Come in REF.......Where are you Rick?
This is highly subjective but I'll throw it out there anyway. I've owned about 5 floor plans and been in and around every one I could ever get near. That is a lot. My absolute favorite is the '50'. An extended 50 is even better but you can't exactly pull that off.
I'm currently building another 50, and my favorite van interior ever was the original 50, a Westy Vanagon. It's just a damn well thought out floor plan that works well for everything.....and this is why at least half the SMB's out there are 50's.