I want to know which one of these amps would fit these subs best? I am worried that If I buy the 1200.1, then I would need to upgrade my battery or alternator's power supple. I already have a Diamond Audio D5 300.4. If I get the 1200.1 on top of the 300.4, would I need to upgrade my power supply? The battery and the Alternator are stock. HELP PLEASE?