My Great Grandmother's name was Peggy Best, also of Allendale, SC., You might try the Bull Pond Section of Allendale -- previously Barnwell County. You might also try the cemetary records for Trinity Church in Allendale. That is where my Great grandmorther is buried. There may be other Best's in the Grave site. Good luck with your search. I may have other information on the Best's but not very much.