i have this unit and REALLY like it for its INSANE versatility -- are you planning to use it to play home-brewed dvd-a disks? If so, you may find its network playback functionality to eliminate the need to burn disks, as you can send high res flacs to it via wired (or wireless, it even includes an adaptor) connectivity. Its d>a converters (it has two) sound quite nice to me too.
One thing -- Darbee is video image enhancement technology, that works best on 1080p high resolution video (i.e. it's worst on 480p dvd video) and does nothing to audio. Depending on your intended uses, you might consider saving $100 and skipping darbee.