Hi All, I'm new to this forum so bear with me. I have just recently bought a Celica Gen 7 and wish to change the Audio system. Here is my requirement, 1. New head unit 2-din if possible 2. New speakers, how many should I after? 3. I'm not after bass heavy, Do I need an amp? 4. My budget is $1,000 I'm newbie in sound system, what is you guys recommendation?