Paul,

This just hit the market today.  32-bit and 84 Mhrtz, less than $50.



http://www.mouser.com/new/arduino/arduino-due/?utm_medium=Email&utm_source=February2013&utm_campaign=CM-GeneralNews&utm_content=IMG4



roger paxton

Has real possibilities once we get the software working on the Mikro Electronica ARM board.