Hi there - I just bought a 2011 CTS premium AWD - the OEM wheels and tires are 245/45/19 but the car has 245/40/20 toyo plus 4 all seasons. The 20s are beauties however, I want to look at getting another set of tires and rims for winter. What do you all suggest I get as far as size? I have a chance to buy very nice 20" rims for $400 but not sure I should go with 20" or down to the 19 inch...would appreciate your input.