Recommendations for a car stereo set-up?

I run an Alpine deck that has a cd player, but let's face it ... cd's are going the way of the 8-track. I use my ipod or a flash drive with mp3 songs on it. I run an Alpine amp and Infinity Kappa speakers front and back. 6X9 in the back and 3.5 in front. I have no speaker deck since I have the drop down rear panel, so I put them in speaker boxes and mounted the amp to one of the boxes. It's loud and sounds awesome. I have a sub in a box and an amp to drive it just sitting in my garage. I think I am going to put them in as well.