I broke down a couple of years ago and bought the Chris Christensen #011 Buttercomb. I was told it was very gentle and wonderful for removing undercoat.
I've been very happy with how it works, it does a great job of working out loose undercoat and Toby, my super sensitive sheltie will tolerate it.
It heavy weight design actually helps you work through the undercoat so that you have to use less force moving the comb through the fur. I was skeptical when the sales person told me this, but it really does work.
There is no real handle for this comb so I wrapped the end you hold in vet wrap for cushioning. This is the only thing I don't like about the brush, they really should consider either creating a rubber cushion or redesigning the handle all together.
It was definitely worth spending the money.
http://www.chrissystems.com/grooming-tools/pet-grooming-show-dog-and-cat-combs.aspx
I also have the 16mm small wood pin brush (because Toby doesn't tolerate grooming tools well), which I also really like. Its extremely gentle, Toby, who hates being groomed, lies there and closes his eyes in bliss.
The sales person convinced me that the 16mm one was enough, and while I really like it, I do wish I'd bought the one 20 or 27mm with longer pins. I do love the 'GroomGrip Handle,' it feels very nice on the hand.
http://www.chrissystems.com/groomin...ooming-show-dog-and-cat-wood-pin-brushes.aspx