Unless you live in Summerlin, do you really need more than even three speeds? IMHO, while the guys here sweat the details like frame tubing material, components, 700 or 27" rims, the vast majority of women mixte buyers/users for the most part want style and comfort. In Vegas, it barely rains so are aluminum vs. steel rims that critical?
I have ridden/reconditioned/sold the Japanese made Nishiki Century, Centurion DX, Fuji, Shogun, and Zebranko Grand Sport. Also Raleigh Grand Prix, Record, and Sprite. Also, countless Peugeot U-18s (U-08 equivalent), Peugeot Iseran Carbolites, and Motobecane Mirage and Super Mirage. IMHO, the French bikes standout, with the U-18s and Super Mirages being the most responsive and fun to ride.
Publicbikes.com makes some great looking new mixtes with IGH.
And if you build one frame up, here are two production Peugeots to inspire you.