Well, blueeyedpop mentioned this to you before, but to repeat, the IsoPod(TM) V2 SR option from my company New Micros, Inc. has:
2 RS232,
SR option takes 7 to 20+VDC and sources a 5V and a 3.3V supply
IsoMax(TM) and Small C provided. Full C available.
Appnote provided to use port lines to directly interface to LCD display
64Kbytes of Program Flash
3 onboard LED's
Size 1.2"x3"
Not to mention 12 PWM outputs which can drive H-bridges or RC Servos, quadrature inputs which can read those encoded Escaps and FaulHaber's directly, 8 ch 12-bit A/D, a CANBus port, an SPI port, 2 8-bit GPIO's,
16 timers, and a bunch of other I/O, and runs the pants off of most other embedded micros, with a 80MHz, 40 MIPs DSP core.