Oh Cindy, I'm so excited to meet you! I don't have any magic sites, I usually use delta.com because DTW is a hub. I've also searched Travelocity and Expedia, which usually come out the same as Delta if I want the non-stop flight. However, if you're good with a lay-over, you can save $$ on your ticket.
Two things I've heard is...Check Tuesday afternoons - supposedly best prices then. And, that the best prices are 45 days before the flight. Now I'm very risk averse and usually can't wait until 45 days in advance - bird in the hand kind of thing. So if you're ready to leap, I'd find my best price and go for it.