Saris bones RS. It is built around a aluminum fram v. a plastic one. Also it is not based off of your "classic" car rack design. Rather than have two straps on top, two on the sides and two on the bottom, there are just two hooks that go under the mouth of the trunk, then two straps that ratchet, rather than strap down. Also with this system because of the ratchet, there is zero possibility of the straps slipping. So on longer drives when the bike is on the back you do not need to worry about checking the straps every time you hit a bump. Additionally, after the initial setup, putting the rack on the car takes seconds rather than 5 to ten minuets with a more classic design. It offers the stability of a hitch or a roof rack without having to invest in a roof system or install a hitch. Also it is made in the USA and has a lifetime warranty with the best warranty team I have ever had the pleasure to work with. I work in a bike shop if you have not already guessed.
Here is the link to the Bones RS on saris's site, scroll down to see the options: