Matt, a couple of comments. Regarding the YGGY, you might find jdandy's extensive review helpful:
https://www.audioaficionado.org/showthread.php?t=41915
The YGGY is very good at what it does, but has limited functionality.
A potential upgrade that's more affordable now than previously would be your K-03 to a 'pre-owned' K-01X. There's lots of discussion on the relative merits of these players in the Esoteric sub-forum.