According to the DTS website, the new Queen "Night at the Opera" disk uses DTS 96/24 which would be better - only a couple of receivers can process it though e.g. the Pioneer Elite VSX-49TX. Supposed to be available at Best buy on the 14th of December.
The VSX-49TX has an RS-232C port which according to the manual "...has the possibility on inputting and/or outputting information to/from the receiver." What did you want to do with the port?
My guess is that a player in this price range must convert the SACD DSD format to PCM (ala DVD-Audio), thus not taking advantage of the audio qualities of SACD (see http://www.audiorevolution.com/equip...acd/index.html ).
Since there are more SACD titles available (though almost all stereo)...