DNA Family Surname Project

I am still making preliminary plans for a Tapscott Family Surname Project. Right now I am leaning toward a 67-marker test, though a 37 marker test  is also possible. I am also leaning toward Family Tree DNA to run the testing. But the cost is not insignificant, around $200, more or lesst depending on the number of markers. I hope I can get enough male Tapscotts to participate. There are several questions the DNA tests could answer or at least provide evidence for:

1. Provide evidence for the relation of U.S. Tapscotts to the Tapscotts of the Exmoor area of England.

2. The proof of continuous descent from Henry the Immigrant, particularly in those areas where there are still questions (e.g., the children of William Tapscott, son of Henry of Caswell).

3. The possibility of a male line from Henry the Immigrant to the mixed-race Tapscotts of Fauquier County, Virginia.

4. The origin of Robert Francis Tapscott, of Clarke County, Virginia

5. The genetic connection of the Virginia Tapscotts with the second large group of U.S. Tapscotts, who originated in New Jersey (some of whose descendants ended up in Ohio).

6. Genetic connections with U.S. Black Tapscotts, who may have been descendants of Tapscott slaves, particularly those originating in North Carolina and in Buckingham County, Virginia.

I am looking for comments and suggestions.