Do you need to meter flash or just ambient light?
Do you want to use the zone system and be able to determine contrast ratios (favors a spot meter), or is that unnecessary for the way you work?
Do you want a meter with lots of features and ability to make instant calculations and store values, etc., or do you prefer something simple and uncluttered?
Do you prefer a digital readout or match needle readout?
Is size/weight important?
What's your budget?
New or used?