If you like using iTunes and the convenience of the iTunes music store but you hate DRM add Advantageous mp3 to your iTunes. It's a small script that lets you use iTunes and the iTunes music store to find new music. But instead of buying the DRM song from the iTunes music store, you can then run the script from the menu bar and it'll automatically take you to the same song in the Amazon music store so that you can buy the song without DRM.

There's version for both the Mac (http://www.advantageousmp3.com/mac/index.html) and Windows (http://www.advantageousmp3.com/win/index.html) versions of iTunes.