Welcome to the Dark Side! Haha.
As an ex-audiophile, I wished I had read this book before wasting my money years ago. Dr. Floyd Toole is the man and I believe his book is a must read. Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms. Think of it as a 50% off coupon for all your future audio decisions.
Spend some time learning the science behind the art of music and sound reproduction. Organizations like AES are full of knowledge.
http://www.aes.org/
- here are some examples from Harman, which Dr. Toole works for.
http://www.harman.com/EN-US/OurCompany/Innovation/Pages/ScientificPublications.aspx?CategoryID=Scientific Publications
The above info could be a little daunting for some. Start here if you are a newbie and need visual aids with the explanations.
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http://education.lenardaudio.com/en/00_sitepages.html
Finally, I always pass along these 4 points to my friends who are interested in audio. Just my opinion.
1. Like our eyesight, our hearing is very different. Some hear well, some are near deaf. Get your hearing tested so you know how your "instrument" is operating.
2. This is No Right or Wrong to audio enjoyment. Your ears, your music, your smile. It is an emotional connection ... screw the snobs and know-it-alls ... so what if you like bad sound.
3. However, note that most of us have only experienced "hamburger" hifi. If you want to know what "steak" hifi sounds like, learn a little of the science so you know what to look for when you are exposed to steak. Some of us do not have the ability to appreciate steak. This gets back to #1.
4. Only pay for what you can hear the difference in. This also gets back to #1. Blind test to give yourself a fair perspective. You will then know if you like it for the sound or because it is pretty. Pretty is ok too, but just be fair and honest with yourself.
Hope that helps. Enjoy the journey!