For a higher performance high output MC, how about a Sumiko Blackbird or at least a BPS EVO III? The Blackbird is a S'phile Class B recommended component.
As for the Denon 103, you could get a Zu103 and matched K&K step-up transformer for less than the Shelter 501 (about $775 total).
As for the Denon 103, you could get a Zu103 and matched K&K step-up transformer for less than the Shelter 501 (about $775 total).