So, the wing in post #2 can generate up to about 77lbs of downforce @ 80mph with a 0 degree angle of attack on the center airfoil. Jumps to up to about 100lbs possible at 10 degrees AoA @ 80mph. May not see more than half of that at normal highway speeds, but it's not insignificant enough to dismiss completely.
In the end, it's your car and your money, and you've got to decide what you want to go for, even if that may be unpopular.
