I have infinity 6 1/2's in the doors and pioneer 6 1/2's in the back and a clarion head unit, a lanzar vibe 1500 watt monoblock amp running two mtx thunder 12's in a box I built myself and this system has pissed off more than a few cops without having it up so loud it distorts. I got everything used except for the.......wood that the box is built out of, one thing,never buy used subs from anybody, I have 4 pairs of crappy subs that "were good when I had them" off ebay. My system costed me 60 bucks for the 700 dollar deck, 150 for the 350 dollar amp, 15 bucks for the pioneers, 35 for the infinity's, 45 for power wire and 100 bucks for materials to build the box. I got the subs in the box new from a friend for 50 bucks. So ebay around and build a good system yourself unless you are lazy or in a time crunch then have the shop rape you.