One (ok several) more thing.
What you are buying is not only a ski rack. You are buying a system that will let you carry other type of items on top of your car.
The ski rack is only the beginning. There are attachments for the rack to carry almost anything. Canoes, kayaks, bikes, windsail (including the mast), surfboards or just general junk.
On my rack, I have carried a sofa and two upholstered chairs and that did look pretty funny. Granted, the sofa was a little bigger than a loveseat and the total weight wasn't that heavy.
I have also carried all kinds of building materials with the use of the gumwale brackets (Yakima). 2 x 4's, 6's, plywood, windows, doors (hung and pre-hung), 40ft extension ladder (20ft collapsed), etc. The metal baskets (Loadwarrior) allows you to carry more junk.
Again, my recommendation is for the Yakima system. I should mention that I have noticed that most bent car rack bars are rectangular/square Thule bars. This is not based on a large study or sample. Just from what I have seen on the road.