The Brause 'Blue Pumpkin' is my favourite nib - I use it for all of my calligraphy and illustration. It's the perfect nib for learning calligraphy, and can be used to create very fine, thin lines, as well as satisfyingly thick inky strokes.
Please note that before you can use your nib, you'll need to prepare it by removing the protective oily coating on its surface. You can do this by giving it a gentle scrub with an old toothbrush and a dot of toothpaste, or with some washing up liquid, before you put it in your pen holder.