I'm excited to see that Trekell (http://www.trekell.com/) has added a new line of high quality brushes as 'William Whitaker Signature Brushes'. Mr. Whitaker (http://www.williamwhitaker.com/) has been my teacher and is a true master, as well as being a terrific human being. His finely detailed paintings are beautifully crafted. We can't attribute this all to the brushes, but they look good, don't they? Anyway,I plan to order some of these as soon as I can.
Here's the link: http://www.trekell.com/William-Whitaker-Signature-Brushes_c_91.html