Do yourself a huge favor.... Remove that RCU, and install a Mach Audio RCU (With tweeters too, trust me

).
The Mach Audio RCU's were in older Taurus/Sables, and sounded a helluva lot better (Especially when speakers are upgraded too!)
I bought my RCU from duraSEL, and if you do want better sound, he was definitely the way to go. The 05 Taurus had the original RCU you have, and yeah... It was... Okay, better than the stereos Ford put in the 1994/95 Escort/Contour/Ranger/Taurus.
One advantage though, the first RCU I was sent was defective, duraSEL sent me a replacement asap, which is always nice to know someone actually guarantees the stuff they sell over the Internet.
The CD Changer is also nice to have, I use mine. I would get the iPod adapter... But I already have the FM Transmitter for the iPod, but what I hate about it... Is trying to change songs.... Just easier to burn 6 Discs on CD-RW, shove em in, and if I get sick of what I am listening to, I can easily switch discs with buttons I have memorized.