e. There you have it. Dozens of good answers to one question.
I'm most comfortable with the Waves RComp, but have used various units all over the place, including ReaComp for example, or a free LA2A
clone from Antress, the Leveler to tame and control VO.
Fairly trouble free dialogue control is the opto mode of the RComp. It gets me very quick results, but VO is often more complex than that, so I hunt for the right unit with the time I have.
DMG Audio's Compassion is probably one of the more versatile units to keep performer-specific presets around for. I only ran the demo, but I already had so many compressors that I didn't need it.
One of my emerging favorites is Klanghelm's DC8A compressor. It deserves accolades of a $300 plugin, despite it's ~$30 price. One of the most versatile units I've used, and one of the best sounding ones to my ears.
Oh, and don't be afraid to use limiters. The Voxengo Elephant can be tuned to react very, very smoothly(long transient time, soft curve, El-uni algo).
Keep in mind that this is the stuff I've used and there's plenty more, as is hilariously evident from other peoples reports.
Good luck picking yours