Right I'm sure OP wouldn't want to bother with swapping to winter tires for maybe one snow storm per year, very understandable. In that case, I would recommend just stay off the roads when it snows that one time. If you really need to, you can get by with NEW all season tires, but anything else, just stay home.Lets not forget the OP is in South Carolina. Unless they are driving to the mountains, (s)he probably sees snow once a year and the entire state shuts down for it.
I'm sure in OP's position I'd stick with good performance all seasons and avoid the hassle of storage/switchover of winter/summer tires.
Also emphasis on the new tires--if the tread is worn out, they're dangerous in snow, doesn't matter if the car has AWD, ABS, or the best traction control systems on the planet, it still has to abide by basic physics (friction).
Also remember, you can be very experienced, have winter tires, and the best AWD car, but that doesn't mean everyone else on the road does. All it takes is someone to slide out of their lane/intersection and hit you, and all that prep is for naught.