We arrived to a similar conclusion as part of our work on this problem at PolarMeter. I do however think that the digitization of an old-school analog meter is a very smart move that will bridge the gap until everybody has a PG&E-style meter.

This company in my opinion has the best mix of cost, convenience and monitoring granularity out of all the ones I found: http://www.powerhousedynamics.com/residential-energy-efficie...

I just posted the retrospective for our attempt at this very problem. Maybe our research can be of help to the folks at WattVision: http://www.kurilin.net/lessons-learned-the-rise-and-fall-of-...