Small low-cost embedded board for a model airplane

Hello Embedded Electronics Experts,

For a real-time signal monitoring and logging application, I am loking
a small, low power and light weight microcontroller board. This board
will be carried on a remotely piloted model airplane. As the airplane
flies it will collect data from various sensors and save them to a SD
memory card as well as it will send selected data to the ground for
data logging and monitoring.

Can you recommend any embedded board which can satisfy the following
requirements?

THX,

Albert Goodwill
AlbertGoodwill @ yahoo . com

Requirements
============
* ADC (Analog to Digital Converter)
    13 channel (simultaneous sample hold is desirable)
    16 bits resolution
     it will be used to capture 1000 samples/ second

* I2C interface
* SPI interface
* 4 X UART
* Free (or low-cost) C compiler and SW development environment



Following are the sensors to be connected to the embedded board
Sensors with analog outputs
    * 3 axis accelerometers (0-5v or 0-3.3v analog outputs)
    * 3 axis gyros (0-5v or 0-3.3v analog outputs)
    * 3 axis magnetosensors (0-5v or 0-3.3v analog outputs)
    * 2 pressure sensors (0-5v or 0-3.3v analog outputs)
    * 2 current sensor (0-500mv outputs)

RMP Sensor
    * 0-10000 RMP sensor with 1 logic pulse per rotation

Fuel Consumption sensor
    *  1 logic pulse per xx milliliter fuel flow

Sensors with I2C iterface
    * 10 temperature sensors with I2C

Other Sensors
    *   GPS receiver (accepting DGPS correction) with RS232 interface