Hi

I am a furniture designer in New Zealand. I am shortly going to be in the process of converting some of my designs to use timber that is readily available in the United States. I can not seem to find a definitive list of what sizes of timber is commonly available.
My current designs use dressed pine (I think in the States it is called dimensional) and in metric sizes. I wish to find the nearest US equivalent for them. I would wish to find a close substitute as I don't want the users of my plans to have to rip the timber to the correct size.
If anybody could give me some pointers to a definitive list it would be most appreciated.