We have used North Country Cheviots for years, very good mothers and aggressive lambs. Alot of people confuse them with Border Cheviots which are alot smaller. There are NCC breeders that have larger cheviots and those are the ones I use. From what I've seen the Canadian NCC are larger than the ones in the states.

The cross I like is Ramb. or Dorset with a NCC to make your ewe, then bred them to a  Suffolk ram.