I definitely recommend crutchfield.com. It's was really helpful for me. Personally, I have the Infinity Kappas in the rear of my notch, which are pretty good, and am waiting for my Infinity Reference speakers for my doors, and a four-channel amp for all four of them. I also have some Blaupunkt ones in my dash, but they aren't that great. Can't wait to hear how the Infinitys sound with the amp! Good luck!