We are senior year electrical engineering students working on a group project. We are trying to design a voice altering device to assist with the improvement of slurred speech patterns in stroke victims. We are looking for a DSP with A/D, input/output audio jacks, C/C++ compatible, max budget of ~$500 for the board and a mic/speakers. Blackfin boards were suggested to us but we're having trouble narrowing down which specific product we need. There are a large variety of choices and we aren't how the specified differences between them would affect us. Any input would be appreciated, we'd like to be pointed in the right direction.