For DVD-Audio SACD, you'll need a universal DVD player (both formats use some form of the DVD format, although SACD has the option for a CD layer). The only approved ways to get a digital output from these players are IEEE-1394 (also called firewire or iLink), HDMI (v1.1 for DVD-A, v1.2 for both), or a few proprietary solutions like DenonLink (although even Denon's approach wasn't approved for SACD until recently). Most of us rely on the player's onboard decoder and DAC's, using the 5.1 multichannel analog output (six analog cables) to connect to our receiver or processor.

Pioneer has done a lot with universal players, including some inexpensive (sub-$200) models as well as some really pricey stuff in their Elite line. Denon has a number of universals, ranging for around $500 to $3500. I am using a Yamaha (the DVD-S1500), which is only a mediocre DVD player (I use an Oppo for DVD video) but is a good DVD-Audio player and a fairly decent SACD player. Have you got a budget in mind? Also, have you looked at the catalogs of discs for both formats to see how much is available that you'd be interested in?