I love my Zildjian Ks, I have a beautiful Kerope, and a few vintage cymbals that sound killer. But there's one cymbal, a Zildjian 17" A Medium Thin crash that I just can't set my kit up without. It's the smoothest, most versatile, most pleasing to my ear cymbal I've ever owned. There's nothing exotic or special about an A Medium Thin but I love this thing.

What's your "can't live without it" crash?