I was shopping for a car in the $40,000 range. The Cadillac stood out in terms of styling and interior space. I chose it over the Acura RL which is nice but looks too much like a Honda Accord. Drives well. Excellent build quality. With 50/50 highway / city driving I get around 21 MPG.
Keyless entry. Driving dymamics. Styling. Build quality. Gas milesage. Power.
Make the keyless entry to work with the trunk as well, i.e. making a button on the trunk lid you can push on that will open it if it detects a key fob in your pocket. Sell the options separately so you don't have to pay $5,000 - $10,000 to get one things you really need.