I have the bottom of the line, 4 speaker factory system in right now. I'm planning on getting the cda-9807 head, type s alpine speakers for all or just polk momos up front, an alpine v12 mrv-820 amp (400watts max) and some 200 watt alpine 10" alpine subs if i get them. I like to feel the bass, but don't need to be feeling like i'm in an earthquake. I play just about everything in my car, minus rap and country.