For a del sol, there is no need for rear speakers....get the components and put them in the door. Get what ever sub willl allow you a 4 ohm mono load (I don't know if that will be the dual or svc model - I'm not familiar with the Kappa line)

Then get just the USX 4085. Run channels 1 and 2 stereo to the components, then bridge channels 3 and 4 to the subwoofer. Voila, you have a nice system that anyone should be happy with, and I saved you the price of a second amp and the kappa 6x9's....see what a nice guy I am