One of the best is also the cheapest. Pick up a new old stock Aiwa XC-37M on eBay for +/-$75. Then pick up a used MSB Link DAC for +/-$175. Have both modified by Stan Warren; which is about $130 for the Aiwa and $250 for the MSB. Total investment +/-$650. Adding a better power supply, like the MSB P1000 or other compatible supply will help make a huge difference. (Cost $300 to $400.)
This setup is the favorite of the Chicago Audio Society. They use it as their reference player I believe. You can check them out, and contact them with questions at http://www.chicagoaudio.org/
You can also search old thread on Stan Warren, Aiwa, MSB. You will find Stan's contact information there as well.