A ducted air-source heat-pump shouldn't cost more than 10% on top of a regular AC system. In my case, the heat pump was the same price as the AC only system. Paid about $8k for a new 1.5ton Lennox condenser and furnace on a townhome. Only options are for electric heat on this property. Re-used existing ducting, line set, and power. Old condenser was toast and an r-12 system.
Dual fuel/hybrid systems will be pricier, but not needed in Georgia. If designed right, the aux heat will be more than enough to supplement.
Poorly sized installations in very poorly insulated homes will need more supplemental heat.