Well, I've never heard a sacd disc, although I'd love to. But if the difference between a stereo sacd and a cd is like the difference between a 128 mp3 and a cd, then I don't see it worth at all. There are really very few albums on sacd, and even those which were released in this format are difficult to find. Just try finding the albums you already enjoy and listen to on sacd, I couldn't find any! Except for the Beatles Love in DVD-audio.
However, I think listening to 5.1 sacd must be amazing, hence that's a great thing to get even for those few albums I was talking about above. So, I'd recommend you to check that the sacd player has 5.1 outputs. Maybe it just needs a digital out, I'm not sure. And then connect it to a 5.1 speaker system. Also, I'd get a sacd player which also plays dvd-audio. Given all the discussion in this thread, I think it's becoming obvious that the difference between digital sources, even if it exists, is not worth the effort or the money. Cambridge audio, and also denon, do dvd sacd dvd-audio players which look quite interesting.
I remember I was very excited hearing first on the radio some 5 (?) years ago about this new SACD format, how it is "even better than vinyl", how the early Rolling Stones finally sound right... I said to myself then, I'll buy such player once they come down in price a bit. I'd better do now, before they stop making them
I used to have a small vinyl collection, but left it all back overseas. I miss the sound but not the hassle of handling, vibration isolation, etc. Can't afford it right now, space-wize, first of all...
128 kbps mp3s and even Apple's AACs sound really flat through my AKG K701s. 256 kbps AACs (iTunes Plus) somewhat better, but still flat. The difference is very clear to me even straight out of iPod (5G).