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?