The Black Diamond Peckers are designed for thin cracks on big wall and aid climbs. They have a time-tested design and come in a variety of sizes. They are pretty durable and come with a few different ways to clip in some sizes.
They are great in the big sizes (and currently the only option). For the smaller sizes, I would probably get one or two and then mainly use the Moses Tomahawk, which is easier to clean, cheaper, and already comes with the much burlier #3 cable.