newto cnc - - - - - - - advice on servo motors please.

Hi,
I have the chance to obtain some dc servo motors. I have the
following specs from the side:-

motor/encoder servo dc
65 volts max, 10A max (motor)
5volts.200pulse/revolution(encoder)
3000 rpm

I am trying to find out

a) are these suitable for cnc milling?
b) what size of mill would they suit best?
c) what would be a fair price for these (brand new)

thanks for help in advance,

Neil McCulley