Faster and less expensive than the BMW X3, the Acura RDX is about as good as it gets in this segment. It drives like a sports sedan and has plenty of storage. If you're looking at the Murano, you should check out the RDX as well. It's faster and a lot nicer, for only a few thousand dollars more. The SH All Wheel Drive makes accelerating out of a corner nice as well. Overall, I'd give it a 9.5 / 10.
Quickness. Bluetooth integration. AWD.
You could make the car 3-4 inches longer for more leg room. I'd like to see a v6 engine as an option as well.