For sure look into any subsidies available to you and see if they make a dual fuel system feasible. In your situation if you buy a high efficiency furnace, it may never make economic sense to run the heat pump, but things could always change and it's a simple enough task to find your break even (economic balance) point when fuel prices change. My current break even point is well beyond the temperature you would consider running heat, but I still run my heat pump in the shoulder seasons to exercise it.