I've always liked those Penworks brushes for the style. How do you like the performance? Their Gemstone Line is definitely something unique, and I may have to add one soon. I've always been unsure of their knots.
One small tip for razor burn. Use your best soap and cream when learning the straight. They will offer you the most protection when you struggle with the angle, pressure or excessive passes. I only used my top soap and top cream until I was comfortable and it did help.
Dave