I am looking for something that I can use to listen to music while i'm on my walks or bike riding, what is a good choice for an MP3 or Ipod to get? What are the pros and cons of the things? Do I have to buy music to put on them? Or can I download music to them from my own cds? I figure I need to do my research before I go and buy one. Is there a certain brand name that is good to go with? Or all they all pretty much the same?