We've got an A3 TDI now and are looking into a SUV to replace it and she likes the T-reg/Q7 TDI or gas, GLk450's, Tahoe/Suburbans. We need towing capacity for a boat and while I love the mileage we're getting out of the A3 I don't see the need for diesel in our next vehicle. Mainly based on price and annual miles we actually will use the vehicle. I also favor the GM as you can still get them nicely optioned (LTZ) but I predict less headaches in older/higher mileage models. Not sure what your budget is but ours isn't putting us in a new model in anything we choose.