I would say that the only place in the Southeastern US that one might need AWD would be in mountain areas. Otherwise, it's a waste of money here in the sunny south. I probably wouldn't buy an AWD X1 if that's all BMW offered, due to the added weight and decreased gas mileage.
I have a friend who lives near Blue Ridge, Georgia, which is a stone's throw from the Tennessee/Georgia border. He has a 1st generation X3 and his wife bought a new 2011 328ix last year. The dealer in Chattanooga had to swap out with a dealer up north to even find one. Since they live on a remote mountaintop that sees snow more than once a year, they actually use AWD. Here in the Atlanta area, we might see a little snow once every two years.
'11 BMW 335i (Alpine White) M-Sport, Premium, Heated Seats, HK, Ipod adaptor, 6MT, dealer-installed PPK - Euro Delivery 5/11/2011
'05 Lotus Elise (Arctic Silver) Sport, HT, Stage II, Odyssey PC925, Lotus Cup 240R Wheels
'87 Nissan Pickup (Burgandy) King Cab, 90k miles
'13 Audi A3 TDI (Ibis White) Cold Weather Package, Bluetooth - Wife's car - Delivery 9/12