So my wife isn't too happy with the crappy stereo and speakers the previous owners installed. I guess they are blown. I'll be looking for a nav system and to fix my dvd system too. What have you guys used? I'll be doing subs also so I'm looking for a complete replacement of all speakers. Should I just put a sub in where the stock one is or just do a normal box? She likes the 12's in my blazer and wants the burb to rock.