Blue Diamond Cue Chalk
Yep, this is the chalk you've been hearing so much about. No, not that redonkulous chalk that sells for 25 bucks a cube but the original high performance chalk - Genuine Blue Diamond chalk.
Sure, it does happen to be a little more expensive than regular chalk but I think your game is worth the extra few bucks, don't you? Blue Diamond seems to hold better than other chalks, which decreases your miscues, which improves your game. So with that logic in place, Blue Diamond chalk makes you a better pool player. Right? Right.
In all seriousness, grab a box and give this stuff a try. It is absolutely worth the money.