I don't mind paying separately to get back tho'. I'd be paying to go forward otherwise.
I will get a PASMO card for other travel and most certainly at least carry ¥ 20,000.Ha, until I looked on Hyperdia, I didn't know the NEX had Green cars. Cool beans.
I'll be paying for Gran Class to Nagano to just experience it and probably not paying for it to come back. We may even start at Tokyo Station at the lounge.
I'll be going to so many places, Nagano, Yokohama, Enoshima, Osaka, Asakusa, Akihabar, etc that I won't fussed about 7 consec days and just do the 14 to cover everything except the last day.