I've tried the Lounge, the Schiit and the ART. Believe it or not, I like the ART the best, and it's the cheapest. Has some lovely 3D air that shouldn't exist on something that cheap. But it does.
All three pale in comparison to the pre-section on my Yamaha CA-2010, same vintage as that C-1.
P.S. -- I've seen two Pro-Ject pres that died prematurely. FYI.