Ok, I need some help. I've decided to get an 18" Fi BTL for my expedition. I have no idea what to power it with.....Sundown? Kicker? what?.... I'm kinda indecisive on the amp because I know its recommended for around 1500rms , but we all know they can handle more. And I want more Safely, do you think I should go with some 3000 watt amp - such as the Saz-300d ? Also, with a 150amp alternator, can I get by with two yellow top batteries? Or should I get a 240amp alternator? And if I do get the upgraded alternator, will I still need a battery in the rear?