EcoBee-3-4-5 or NEst

ecobee! nest has a horrible reputation.

It draws power from the furnace/air handler transformer with C connected, so if furnace has power from a generator or other source when grid goes down, ecobee should work.

I believe it can control the humidifier using the accessory terminal, would need at least one extra wire to the stat.

Read specs and literature before buying to be sure it does everything you want.