Yep, these cities just make most others look unrealistic. Great work.

It is difficult to make these cities fit in with others, so I guess you'll have to make some more sets for us.
On the square / circular wall debate - I believe that the archaic and classical greeks tended to stick to straight lines, especially as they did not use arches. It's later that western architecture starts to use curves and arches.
Derf - Do you play Travian? Are you from Dorset?