Seriously though TTE, there's tons of devices out there, the
iPod is the most well known. What works best for you depends on your needs. How much do you want to spend? How many songs do you want to put on it? You don't have to buy your music again, you can just rip your CDs to your computer and go from there. Apple has the market cornered because of the ease of use and the seamless integration to their online music store, iTunes.