I have a Behringer DCX 2496 with custom mods from Doug. He transformed the unit from a budget piece to a world class sounding piece of electronics. His workmanship is top notch and his ideas and modifications are very innovative.
I have also heard the ASi modded Oppo units (980 & 983) and they are stellar. They were very popular at the Audiokarma '08 AK Fest as several vendors used ASi modded players as their source with great success.