I use and LOVE the Chris Christensen gold 20mm pin brush.
http://www.chrissystems.com/brushes.htm
They have wonderful brushes all be it a little exspenseive, they are totally worth it. I don't think I will ever need to buy another brush. They have alot of good info on their site about dog brushes and how to do the "Pin Test" to see if a brush is scratching your dogs skin. Needless to say, the brush I WAS using got tossed in the trash after I did the Pin Test with it, now my babies love to be brushed. The gold pin brush also works wonders on getting tangles out.