I just got my first real system set up. Right now I've got a Yamaha 465 driving 2 M60's and a CS1, no sub or rears. Is there going to be a huge difference between MP3 and CD? All of my CDs have been converted to MP3, so they are all in boxes currently. My AVR has a portable input to hook my mp3 player up but I was also thinking about getting a fairly inexpensive used single or 5 disk CD changer, is there a huge difference in sound quality that would make this a good option or should I be fine just hooking in my MP3 player?