I have two Advent 5002 speakers that I bought in college way back when. They are in excellent condition and I want to use them again. They're fine for me, they're paid for, and they're what I can afford. I want to play music from my iPhone, and maybe a CD player, out of these so I'll have decent music in my house again. What do I need in order to be able to do that? I am not familiar with any of the receivers that are on the market. Finding one on Craigslist is fine with me but I'd like some guidance on what to get or not get.