i think having an excellent tubed preamp is crucial to extracting musicality from digital sources (at least current redbook cd). i found that upgrading to a (~$2k used) melos music director preamp leveled the playing-field of cd-players up to at least $3k - an $1800 alchemist & a $3k resolution-audio cd50 offer no significant improvements over my $500 nad cd-changer in my system. added bonus is fm & vinyl also have never sounded better! ;~)
w/the current state of digital's future up in the air, inwesting in a top-notch preamp will improve yer entire system, & if/when the next-generation digital playback system is supported by readily-awailable software, yule then be able to upgrade yer digital source & plug it into a great preamp.
one person's opinion... doug s.
ps - don't get me wrong - i tink the simaudio electronics are really nice, but i tink ya need a toob pre at least - or, perhaps a toob-amp - to get great digital sound at anything resembling a reasonable price.