My small, Southern California house was built in 1950 and has the original floor furnace. I would like to upgrade to a digital, programmable thermostat ($30 to $60 price range) with a display that shows both room and set temperatures. The existing thermostat is an old, round, two-wire Honeywell (Model #T87F2873-3-8437). What thermostats would you recommend that I check out? How about one of the millivolt-compatible thermostats made by Honeywell or White Rodgers?