Yeah, smart thermostats are hard to choice. Lots of decent options. Honeywells are certainly in the running, but for now my heart is set on Ecobee. I forgot who here's got one, but he mentioned that there is feature of turning of ventilator (without heat/cold) every 10 mins - I think that alone could be a huge deal. Obviously It must be able to automatically switch heat/cold systems.
I recently played with few of these toys in local home depot. Again ecobee seemed to be better made (materials and design) than others.
And you're spot on with Nest - I don't particularly care for drifting temps or vague imprecise settings. Plus again - without cloud it would be a paperweight.