I keep two boar brushes in my rotation, an Omega 10066 like BobH and a custom with an Omega knot. They are both excellent! The 10066 can still be had for between $7 and $12. I also have badgers and synthetics.
10066
http://img.photobucket.com/albums/v6...pslbxyc4gc.jpg
Custom
http://img.photobucket.com/albums/v6...ps30maajbi.jpg