Speakers

People can often get quite extreme with their speaker purchases. For most, mass market speakers are often adequate. Then there are those that get more mid-level speakers who catch the bug and can't stop. Just remember, there is no sense in buying $20,000 speakers, as you can't hear any better than the recording source. For example, if the audio source you usually listen to is cds, what monitors (speakers) were used in the studio to record that cd? There is no sense in buying anything that can handle more than that.

If you're the handy type, you can also build your own speakers, there are plenty of homebrew speaker projects found online.