OK, Sparkfun site back on line now.
Other than the scale - in which case the 5V one might suit you better, there is no difference between a 1 mA meter and the 5V meter which is already a 1 mA meter with a series resistor (5k less the meter resistance). The 1 mA meter might give you more flexibility in using your own chosen resistor, and the zero to one scale might suit you also.