Embedded Open Modular Architecture/EOMA68/MiniEngineeringBoard
Micro Board: Engineering, Engineering and Experimentation
This board's primary purpose is to provide a wide range of options for experimentation purposes, as well as an Open Platform for Free Software Development. It therefore includes a low-cost on-board ARM Cortex M3 Embedded Controller. A secondary purpose is for the Micro Board to make the development process of in-house designs a smoother and easier prospect.
The STM32F appears to be the best choice, for exactly the same reasons that Olimex chose the STM32F for their Olimexino. In large volume, the STM32F103RBT6 is around $USD 1.00 to 1.50, making it highly cost effective.