I'd stick with a single component set up front and forget about rear fill. You can always add that in later, but with proper amplification you should be pleased. I would try and fit the 6.5's if you can find a way to accommodate them. I've heard the SR's and really liked them. I can't comment on the Hertz, but hear nothing but great things as well. As someone else suggested be sure to deaden and seal the doors. It will not be worth the investment if you don't.