Brad I prefer the carding brush on silks, just like it does on velvets, it keeps streaks from drying into the rugs. Excellent for grooming silks and rayon's that dry so stiff.
Braun brush is the place we'd get our from too.. It used to be $22.00 a couple years ago.. Inflation is a bitch!
Or you can call Paul Lucas of ChemMax and get the carding brush roller for the Certified Pile lifter and make easy work (of standing up the nap and making it softer) of it.. It is kind of pricey, but the guys will love it..