9's are a dime-a-dozen...at $9.59 a box, you cant go wrong. Especially for me, almost every time I go to the range (80%) I bring my Beretta M9 and my Glock 17. Their fun to shoot, and add selection to the "toys" I get to play with.
But besides that I love .45 Auto (My favorite round). My Springfield Armory M1911-A1 "loaded" stainless and my Heckler&Koch USP Tactial .45 are two of my "heavy hitterz".....accurate as hell, and have enough muscle to scratch my itch.
.223 remy in my AR-15 I shoot alot too...also cheap $5.45 a box (Win USA)