Hi
I am building my first modualr system with a little grant money i got for research. For the first 1000$ i got a beginner Pittsburgh Modular system and one envelope module. FOr the second 1000$ to complete the grant i am considering
http://www.qubitelectronix.com/#!nebulae/c23nm
The nebulae says it will run custom Csound and pd code which i find very intriguing.
The manual says "The module uses a Raspberry Pi as a CPU." So you could get yourself a Raspberry Pi, or even better, UDOO board, run Pd on it and save some money and gain some expertise on the way, and stay independent of a additional commercial hardware provider.