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I've used the PIC24 and liked it very much (except the fact that 24F doesn't have EEPROM). You could use PIC24F and PIC24H as well as dsPIC30/33 but the DSP part may be unnecessary. You can also look at microcontrollers from other organizations like Renesas, Freescale, ST and maybe ATMEL (ATxMEGA? not sure).