Purdy 140400930 3" Chinex Swan Brush
This is essentially the straight cut companion to the angled brush I selected as number one. One only need look at the thickness of this 7/8 thick brush to see its quality. It is also a tapered brush, something that is a little harder to accomplish on natural fiber brushes. The tapering helps you control the brush, especially when using it for cutting. A stainless steel ferrule guarantees that it wont rust.