Infinity Kappa 3 way 6x9's here. Even with the back seat notch they will still just barely wedge under the trunk rods. Not cheap but they thump pretty good and come with Capacitors pre-wired. However I also have 2x10"s in a box and running 3 separate amplifiers in the trunk and it all just fits on the ledge.
I put 6 - 4x6 Pioneers in my Safari work van and no matter what I do they sound "tinny" to me. Going with Kappas again for my bucket truck when I get around to it. I use JayZ "Hard Knock Life" for tuning. It's got a good vocal and music range with a bunch of Bass. Fleming would be the guru for this stuff though. I'm nothing but a hack who is going deaf from listing to music way too loud for too long.