8260 will not output a digital signal when SACD is playing. you can use the analog outputs of your 8260 to listen to SACD and at the same time have a digital cable going from 8260 to a separate dac for redbook playback. you just need to use 2 different inputs on your preamp, one for dac and one for 8260. Of course you will have to have 2 sets of anlog interconnects as well if you want to do this, unless you are going to switch them between the dac and the player.
IMO, if you get a good used dac, playing a redbook disc on it will most likely blow away the 8260 playing the same disc SACD version, so you will have no desire to listen to SACDs on it.
IMO, if you get a good used dac, playing a redbook disc on it will most likely blow away the 8260 playing the same disc SACD version, so you will have no desire to listen to SACDs on it.