I see you have an aftermarket deck... to get the best results from that deck, you'll want aftermarket speakers. Although, im kind of confused here... you're asking this question, but you probably listen to them on a daily basis. Does it sound good to you? If you think it sounds fine, then by all means keep the stock speakers. If you want greater clarity, a little increase in maximum volume and better midrange as well as bass, then upgrade the speakers.
The EX model accords at least had a pair of tweeters in the dash... makes it sound better than the other models. For my personal taste, I ripped all the OEM stereo equipment out before I even drove the car (except for the test drive, and the drive home). I'm very into music, and it must sound good for me to appretiate it.