punky,
I want to encourage you and others to work diligently at saving the composite breeds developed in the Americas; even though they are in many cases not much more than a century old. In the world of chickens that consititues a Modern Breed. That is why I've worked so hard with the Cubalaya. I was not content until I owned stock from ever well established strain of Cubalayas in the United States; preservation and improvement are two words that should go hand-in-hand.
That said, I would strongly advise keeping one of the Ancient breeds of fowl. These possess great genetic value to us. They are also becoming extremely rare; at least good ones are. Some of these breeds are in such a state of deterioration that if not bred correctly soon they will perish from the American scene.
Take for example the Malay: the Malay as found in the States and Canada today is a mere shadow of its former self. In the past, the Malay was used to make and invigorate many Modern Breeds such as the RIR, Chantecler, Buckeye and Cubalaya. Today, they are nearly gone. The ones that remain are in terrible shape with many problems (legs, heart, shakes, etc.). There are only a handful of real Malay breeders in the USA: Billy Sumner, Carl Brantly, and Ronnie Proffit (they may be others but they don't have the stature of these 3 breeders).
Any way you cut it 3 primary breeders in the USA is not enough to maintain a breed.
You and others need to seriously consider what I'm saying.
We can save the RIR, Chantecler, Buckeye and Cubalaya: that's great. But if the ORIGINAL breeds that made these pass from the scene then we have lost something that CANNOT be replaced. Composites can always be replaced: Originals cannot.