I agree with Audiofeil, the old Hadcock 228 works surprisingly well with stiffer carts too. I've tried an Ortofon MC30 super in it with good results. Have not tried the Denon 103 in it though. I would not call it a traditional unipivot since the "needle" goes into a bearing with 4 balls. Mr Hadcock tried a 3 ball bearing as well but found that 4 balls gave a better result.
The arm is a b*tch to set up though...
The arm is a b*tch to set up though...