Ok, this is just my $.02, but don't take anything "live." Go through your CD collection and find some really great recorded discs. Search for ones that throw a wide soundstage, nice image, etc. I foind it also key to bring in some female vocal tracks (Natalie Merchant, Diana Krall, etc..). Also, bring in a majority of what you will be listening to (again not live stuff) whether it be rap, funk, jazz, blues, rock etc. Oh, and don't buy the day you think you have found something. Go back and listen a few times because your mood can change. Have fun...
SC