Mutliple thermostats

I would like to use something like the Venstar Wireless THermostat system http://www.smarthome.com/30403a-wireless-thermostat.html so I could place wireless thermostats downstairs and upstairs, then using Indigo control which themostat was used to set the temperature when, i.e during the day use the downstairs one and at night use the upstairs one.

It would also be nice to be able to set wether the ac was on or the heating (depending on time of year).

Any suggestions?

Thanks

David