I work for a company that sells and services medical imaging equipment (think CT, X-ray, MRI,...). We recently explored our field engineers kits and decided to stick with the pricey, but super dependable Flukes.
For accuracy, you want an OScope. For quick measurements, the ole dmm is the way to go.
I've seen lesser dmm's be off by more than 0.7V, and that's when you start getting into trouble with your measured results.
I just got a Umik and the REW software. Now I just have to figure out what to do with the results REW gives me.