fordf150tx

So I am starting to get some good audio going on in my truck, nothing to serious but just want to make sure nothing fails. With that being said. I have 2 amps 2 subs HID lights. Total amps is around 2000watts. Not sure if I need a badA** like 400amps or anything, but again, I am new to the alternator world. What would you have that would support my setup, maybe something with a little extra room to add on additional items including bigger amps/subs? I look forward to your response. Jeff -