In order of most used..
Alien Skin Exposure 3
Portraiture 2
Topaz DeNoise 5
Topaz ReMask 3
Genuine Fractals 6
I've been intruiged by NIK Silver Efex 2, but don't see how it could be THAT much better than the B/W conversion options with the Alien Skin product. Anyone who has Silver Efex pro up for a comparison thread? I can do conversions with the Alien Skin and we can compare.

