I've been using the stock speakers (plus subs) in my 2006 Chevrolet Malibu since I got it. They're not too bad, they don't distort or anything at high volumes, they're actually pretty good if you ask me. They sound better than the upgraded Bose system in my moms 2011 Enclave.
Anyway I'm looking to start off small by replacing the two 6x9s first. I'm looking to spend around $50 and don't want to go over my budget too much. I've really been leaning towards the Kicker DS693s but I'd like some other recommendations too. I don't plan on having them amped, just powered by my head unit.