I am not familiar with that family but it appears the MSP430G2X53 series (such as the 2553) is 20 pin and has a UART and I2C. You might want to take another look.
Yes, the MSP430 Launchpad comes with a MSP430G2553 that has UART, I2C and SPI http://www.ti.com/product/msp430g2553
It's also a 16 bit micro instead of the 8 bit micro of Arduino.
The Stellaris Launchpad is a ARM based and not available in DIP
Biggest difference for both of the Launchpads from Arduino is they use 3.3 volt I/O instead of 5.
I was thinking your board could connect with the headers and/or ribbon cable to the Launchpad rather than use a DIP socket for the TI chips..
The 20pin MSP430G2X53 looks promising. I've zero experience with the MSP line (I'm a PIC expert
Much like an Arduino, it seems the HW serial port is used for the built in? bootloader as shown on this page http://processors.wiki.ti.com/index.php/BYOB
Also the I2C is available. It barely has enough I/O but it has enough.
I'll put a 20pin DIP socket on the PCB if the following can be answered.
Will this run sans crystal (internal osc)?
What pins aside from TX/RX are required for bootloader operation.
Can I use any bog standard 3.3V USB to serial with TX,RX,DTR & CTS (Arduino)
Does it have PWM out?
Does it have an external timer input (for a 3.6864MHz source?
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