Over the next few months, i am planning on upgrading my system in my car. Right now, it consists or 2 12" Image Dynamics, a 1000 Watt crossfire amp, a 150 watt crossfire amp, Brax Components, Clarion Headunit. I want to get a new, in dash Dvd/Cd/Mp3, and also a new amp for my front speakers, and install the 6x9 crossfire speakers in my back deck. Along with the In dash will come PS2. Now, luckily i havent had a problem with my alternator yet, but this will put it over. So i dont know if it would be better to get a Optima YellowTop for the trunk and an isolator, or a new High Ouput Alternator, like 160amps.