Used to use a Fluke, now I use a Protek 506. True RMS even on non-sinusoidal waves, works as a data collection gizmo, backlight, lots of features.
Another meter I wind up using a lot is my RSR MS8209. Get this - in addition to volts and amps all, it has a built-in light meter, humidity sensor, sound decibel meter, and temperature gauge. This fun stuff comes in more handy than you would imagine. Instead of guessing that something's brighter than something else, or louder, or maybe humidity is a factor - you turn the selector knob and find out. And it's only $80.