Amesja - Cost is very important... consider that the Soma Buena Vista mixte can be purchased complete for around $1100.00 with a 3 speed drive has a frame set that costs around $500.00 that is made from some nice Prestige double butted tubes.

My better half purchased one of these and loved it as it is a very nicely built frame but returned it because the wheelbase exceeded the maximum on her local transit system... the bicycle was purchased specifically to provide a lighter bicycle for a longer multi modal commute and because it could not be put on a bus rack was a fail.

I built up her Peugeot for when she is here so that she has a lightweight (and she loves Peugeots), her regular commuter is a very comfortable but heavy Breezer with an 8 speed IGH and probably hits the curb at 45 pounds while a bike like the Peugeot is a middleweight and rolls on much faster wheels.

Anyways... moving up from the Soma you are probably starting to look at custom options and we could build a mixte frame and fork but our cost would be around $1600.00 for what would be a filet brazed model with butted tubes.

At out co-op mixte frames are a hot commodity and none of them last very long... the number of high end vintage mixte frames is pretty small as not many were built with high end frames. My little sister has a Kuwahara mixte that was built on an Ishiwata frame set that is outstanding and this would have been a fairly pricey bike in it's day.