.40 S&W, 10mm and 5.56/.223.
.40 S&W , well that one's obvious.
10mm because so many people think it's an awesome powerhouse, when in reality the same pistol platform in .45 ACP with decent springs and full chamber support will eat its lunch, any day of the week.
.223 I don't actually hate, but for my purposes .222 is better. Especially for cast bullets.