AVR-Chat

I am looking for a production microcontroller/computer  board that 
has 50+/- I/Os with drivers, two RS232 ports, RS485 port, LCD, 10+/- 
ADCs, 3 DACs, Ethernet, 512K+/- memory. We also want stand-alone IDE 
testing and field flash programmable. We use about 20 a month in 
small industrial equipment (and prototypes) to drive several motors 
(steppers to .5 HP DC). I have used AVR and wanted to see what was 
available. If you know of anything similar  or somebody else besides 
AVR that is fine. Basically I need a 4"X6" ish board that does about 
anything a robot hobbyist would want.