It is rare to see that type of review, so yours will be very interesting indeed. The Meridian is a whole different level from the 990, and you should be able to definitely hear the difference. At what reduced level though is "good enough" going to be, hmmm? Remember as you moved up the ladder all the appreciable increases you experienced, will now be reversed. I too just did my own comparison between the 990 and an older NAD pre/pro, mainly for audio reasons (dvd was a no brainer). The Outlaw won and is staying in my system. I did the A/B a little different though, you might want to try. Put the 990 in place of the Meridian for about a week, listen only to it, then take a day off and change back to the Meridian, your "yes or no" about good enough should be instantly apparent. If not, then do same time A/B testing. Look forward to your post. Oh yeah, don't let your bunch of guys know you switched it out.