I built a house last year...not only were 2 bathrooms a MUST, the location of the bathrooms were important to me, too. I definitely needed 1 downstairs.
I built with a "cookie-cutter" contractor as I can't afford a "custom-built" home...and the MAJORITY of their floor plans had just "half-baths" downstairs and they were either located in the KITCHEN or right off the DEN!!!
Uh yeah, let me go to the bathroom right next to where everyone is eating...or watching TV.
I swear, I just don't think builders think ENOUGH about BATHROOMS!
I love those restaurants who are smart enough to pipe music into the bathrooms...BRILLIANT.