1. That Raleigh Tradesman above is awesome.
2. As for the mixte, there's a few shops around my metro area that would absolutely build a bike like that and hang nicer components like the seller above did. The price would be every bit of what he is asking as well. At a certain point though, it would be a question of how comfortable one would be both buying and selling in that type of (private) market. As a buyer, judging by the build (and perhaps his other work) it would probably put you at ease a little more. As a seller, it would appear that he believes there's a market out there to sink that type of work and money into a bike like that. So...