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Digilent just launched the Cerebot MC7 development board. It is based on the Microchip powerful dsPIC33FJ128MC706A digital signal processor and it features 4 onboard half bridges circuits rated for up to 25V 4A. Compared to their previous development boards based on Microchip microcontrollers like the PIC32 this one has a dedicated DSP which should improve your performance when doing digital signal processing. The board is currently priced at $119.