Linear Tube Audio has an extremely well reviewed David Berning design within you price range (maybe $50 more if you want the remote option).
It also has an onboard headphone amp which may, or may not, better the Saga you are currently using.
https://www.lineartubeaudio.com/products/mz2mz2-s
DeKay
It also has an onboard headphone amp which may, or may not, better the Saga you are currently using.
https://www.lineartubeaudio.com/products/mz2mz2-s
DeKay