Just listened to the Marantz for another hour. I also own the Marantz 8003 SACD/CD player, which has been replaced now by the 8004 (see another thread under this folder). The 8003 , 8004, and the NA 7004 all use the same cirrhus logic Dac chips. The sound of the NA 7004 playing standard res files is similar to the 8003 playing redbook CDs. The NA 7004 does sound different than the 8003 playing SACDs. They both sound great but I give a slight preference to the SACD. Is this due to the DSD encoding for SACD? Can't say.
Marantz dealers are easy to find. If they can't demo the NA7004, then see if you can get a demo of the 8003 or 8004, which are very close to the NA 7004.
Do you have a DAC? If not, then the NA 7004 may be a more logical purchase than the sbt