Personally, I'd go with the "AcousTech Carbon Fiber Brush" from Disc Doctor
. They are decent quality whereas some of the 'look-alikes' tend to be of poor quality and continually lose fibres, almost from day one.
+1. Spend the few extra dollars and get a name brand CF brush, such as the AcousTech, Audioquest, or Hunt models. A good CF brush can last for 10-20 years, so when you spread the cost out over the lifetime of the brush, the per annum cost is next to nothing. The cheap copies are notorious for shedding and are worse than useless.