I've owned Ah! tjoeb (not upsampled), sony 9000, heart modified, and 3 different Modwright players. I thought the tjoeb sounded really wonderful in some areas, but was amazed by how much bass impact I thought I was missing compared to a stock Sony 9000.
If you are thinking about something in the range of a few grand, I've been amazed with the playback of the Modwright players. For $3k you could get a rediculously tricked out (superclocks, bybees, tube stage, upgraded connectors) player regarded by a few reviewers as the best available (sorry to get into the modded vs. unmodded debate, but modded has always outperformed for me in my system IMO et al.)
Right now I'm using a modwright signature 9000 with tube output and bybees.