Depends on your application. If you plan to use it for simple voltage, current and resistance measurements almost any meter will do providing it has enough resolution for your intended measurements. If you plan to make any AC current measurements make sure that a current clamp accessory is available and that your meter can read True RMS. Multimeters are not the best choice for measuring Audio levels because of their limited frequency response. For level measurements an old HP400EL can be purchased for $150 on the used market. If you plan to do some serious audio work nothing will suit you better than an oscilloscope. A used analog scope can be purchased for $200 to $500 depending on bandwidth but if you have the money, a Tektronix TDS210 digital scope can be purchased. It's a 2 channel, 100MHz digital scope with a sample rate of 1 GS/s for ~ $1000. Even better is the fact that you can add an FFT plugin for a few hundred more that enables you to make measurements in the frequency domain like a spectrum analyzer.
What to look for in a multimeter?
One quick question to follow my earlier question-- is there any kind of special multimeter that I should use? Radio Shack has multimeters from $19 to >$200. As long as it has two leads and a digital readout, should I be okay with one that is on the more affordable side? What other features besides voltage measurements should I need. Thanks again! d