I drive a Legacy, and had a hitch installed, even though the car is so low that I hit the hitch pretty frequently in driveway entrances... I still wouldn't go with anything else.

I use the Yakima Hold up rack, which is expensive, but with my 2" hitch, I have a 2 bike rack always mounted during cycling season, and a 2 bike extension as needed when I am bringing more than one other person with me.... It is nice to not have the extra long rack other than when I need it.