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, dealer-installed PPK - Euro Delivery 5/11/2011
'05 Lotus Elise (Arctic Silver) Sport, HT, Stage II, Odyssey PC925
'87 Nissan Pickup (Burgandy) King Cab, 80k miles
'13 Audi A3 TDI (Ibis White) Cold Weather Package, Bluetooth - Wife's car - Delivery 9/12