Just a comment on the aerobars, the argument for them is noise reduction. I went to the less expensive square ones after the Yakima round bars, and find the noise level greatly more manageable even just with the squares. I should note that in the car I listen to classical music which has more dynamic variation than pop music. I do lose some of the really quiet parts, but for the most part it is OK. My biggest noise factor is not the square bars but the Two Hullivator units.
It may be that for your purposes, going to aerobars that include the feet is cheaper than going square. Depends on how much.