If you can only have one test lp, this is the one to get. The Cardas Frequency Sweep and Test LP is the one that most people find the most useful. Besides tracks that are helpful for setup, it also has a frequency sweep that helps keep your analog chain sounding great.
The Hi-Fi News and Record Review Test LP is also useful for setup. I use it mainly for testing the resonant frequency of the arm and cartridge combo I'm using at the time. Most people don't use the tracks designed to test anti-skate as they are just not realistic. That is, by the time you set anti-skate high enough to pass these torture tracks you will be squashing the dynamics out of the music.
