2 great subs for a low price would be Hifonics HF12D4's, I had 2 and was very pleased with them. The only reason why I don't have them any more, is 'cause I can't have a loud car, since I have a newborn. If I was able to have a loud car, it would consist of these.Looking to buy 2 "ok" 12s, box if possible and an amp, looking to spend around 400.