I am designing a lot of boards with an LPC2141 ARM7, Altera 3c25, USB
client, RS232, SPI, uSD. No ram, no Linux, just the builtin flash and
RAM of the ARM and FPGA, and 1MByte SPI flash. The frontend is fitted
with a variable number of ADCs of various types.
It is optimized for precision analog measurements. The FPGA and the ARM
live on differnt ground planes, with LVDS-IO between, to isolate the
noisy digital world (computer) from the frontend. This board is
sandwiched between a power regulator board and a preamplifier board.
The inputs to the preamps are usially quoted in pA or fC, that is just a
few electrons.
I don't think this is what you asked for, but, if that comes close to
what you need, and are ready to do your board yourself, I will share my
design to work from. Most work is in the software/firmware.