live as close to Boise as they possibly can. Meridian is becoming Mormonville for the Treasure Valley and I would almost say becoming the hub of the valley too. If they want a more rural feel then they could live closer to Kuna but expect a 25-30 minute commute. Property values are a lot more affordable in Nampa and Caldwell. Caldwell isn't that bad but there is not much to do there and the commute can be horrific from Caldwell and Nampa.
If they want to feel rich and uppity then they can live in Eagle or on Harrison Blvd in Boise.