CD vs SACD in STEREO

Just found that there is really no (practical, only 2 or 3 obscure ones found) 5.1 SACD external DAC. So it is either using the player built in or the receiver built in DAC. Which way to go with mine? 

System 1 with Oppo 103 and Onkyo TX-RZ810 via HDMI

System 2 with Sony UPB-X700 and Denon AVR-4520CI via HDMI

This is why cd transports are being made so you can put a new separate dac newer better technology and sound processing. Some of the old spinners have the fiber optic out that can be used as a transport only. My dvd player is panasonic  u9000 and sits above my soulution spinner for the money not that much difference,10% and to most that not worth 100's of multiples in $. Panasonic makes great chips and capicitors for decades. Why does com cast not use USB, hdmi for thier internet and does fiber optic and maybe cuz the long runs. Enjoy the music and the experiments

HDCD sound great! Too bad that also failed.

@mark200mph As mentioned, no separate DAC available for real 5.1 SACD. 

Anyone know of a good placed to buy SACD's other than Discogs or Music Direct?

There seems to be such a limited supply of them.  I have a Cambridge CXUHD player that has been used approximately five times and has been boxed up for years.  They have no DAC in them and will play SACD's, but you can't get the DSD stream out unless you have something such as the D.BOB that will put it into a DAC with an I2S input.

Sony really made this way too difficult in my opinion.  I mean SACD sounds, good, but in my opinion, it's not night and day difference between good Redbook CD's, but I'd prefer to go the SACD route if it were more convenient.  I'm not interested in ripping them to files.

Thanks