hey guys i just joined here and have no idea what i need for my car. i have a 2003 mercedes c240 with factory headunit and speakers. im lookin to put 2 subs in the back and a new headunit in the front. i dont need a DVD or gps pioneer headunit cuz im lookin to spend 150 and under on the headunit. my cousin tells me i need new speakers to go along with the subs if i get them. if you guys could lead me in the right direction that would be great. thanx