in selection your application area is very impotant...if you need dsp for control applications i highly recommend motorola 56f8300 DSPs...and you can buy low cost 56f8300dsk board from www.digikey.com
If you want to select a processor you should at first know what tasks it will solve,
what you need floating poin or fixed, DSP functions or microcontroller, how many MIPS or MFLOPS, the price of future device etc.