Charlie,
I loved your sound of the city compilations from america, especially the new orleans and memphis editions. They opened up a lot of (old) new music to me, but if you don't mind me making a suggestion, how about doing one each for london, liverpool and manchester? You can trace back good music from each city (with the exception of possibly manchester) to the mid fifties, and even before. It is quite rare to come across compilations of such quality, and it would be great to show off some of our own musical heritage in the same way.
what do you think?