Had a Westfield (Eleven) and still have a car built by Birkin (not a Seven.) I've toured the factory at Birkin and it's not a backyard garage operation. Modern and large factory and these cars have always been first rate. As you have already owned one, you must know Dick Brink. He can give you the current info on them. Westfield is going to be more expensive, quality is good but maybe not to the standard of Birkin or Caterham, I'd say more typical of a "kit car" product. Still, very nice. Doubt if you'll go wrong no matter which you choose.