Need recommendations for a Step Up Transformer for Denon 103

I have a Denon 103 that needs a SUT. I'm told that the Denon performs best when loaded with 470ohms. I'm new to the world of SUTs and would appreciate recommendations on a SUT that can achieve this specific loading or one close to it. My budgiet is ~$500 but preferably less. I've heard good things about the Ortofon ST-7, Parks Audio Budgie SUT, and the Rothwell MCL...