I get promotional emails from Rutland Tool, and they have a sale going on that caught my eye:
Down at the bottom, they have a Noga Flex Gage Holder marked down from $99.17 to $53.95 (have to use promotion code OB115 at checkout).
I've had one of these for about 15 years, and it is the one I use almost all the time. It's very easy to set up at weird angles, has a good reach, and it's plenty rigid once it's locked down. It's also the smallest magnetic base I've seen with the quick release button. I think I paid close to $75 for mine, and considered it a good deal.
No relationship to Rutland, etc. If I didn't already have one, I'd snap this up in an instant. As it is, I had to wrestle with whether I really had any use for a second one.