Although I haven't personally played them, I think you should look into the Paiste Formula 602 Modern Essentials. These cymbals were designed by Vinnie Colaiuta, the same guy who designed the A Custom line with Zildjian.
But from my personal experience, A Customs have a very bright, silvery shimmery quality that I really like. I currently own a Sabian Vault crash that sounds VERY similar to the A Custom crashes. But I bought that cymbal years ago, and I believe that it is now currently under the AAX lineup as the AAX V-Crash. The AAX Studio Crash is another cymbal I've personally played that is remarkably similar to the A Custom. So that would be a good place to start- Sabian AAX V-Crash and AAX Studio Crash.
I haven't played too many Paiste cymbals, but the 2002s are very bright and cutting like the A-Customs. You should try those out too.