Any of the Oppos would be good for SACD and CD playback. If you are going to use HDMI, the cheapest Oppo would be your best choice, because it can output DSD (and is the cheapest). Outputting DSD means it outputs the signal as it is on an SACD, which is a good idea, but, unfortunately for those who imagine it is a terrible thing to convert the signal to PCM, most receivers will do just that for processing the signal (e.g., bass management, etc.). So the reality is, for most people, it really won't make any difference whether the HDMI output is of DSD or converted to PCM, even if such conversion made an audible difference (which it probably doesn't, if done properly).
The analog audio outputs for the players are supposed to be, in order from best to worst, DV-983H, DV-980H, DV-981HD, though whether you will actually hear any difference or not is another matter. For just SACD and CD playback, and nothing else, I would go with the DV-980H. But for playing DVDs, it is the least good (and cheapest).
The Oppo players are easy to make region free, and the DV-983H and DV-981HD are great for upconverting PAL DVDs to 720p, 1080i, or 1080p @ 60 Hz (the DV-980H is less good for this, because it first converts the PAL to NTSC [which throws away lines of resolution] and then upconverts). [For my purposes, these matters were crucial to my decision, as I have quite a few PAL discs and quite a few non-Region 1 discs.]
Probably, the Oppo DV-983H is better for upconverting DVDs than the PS3 or any other Blu-Ray player. But I have not seen a proper comparison for this. However, I have never seen a review of any Blu-Ray player as an upconverter where proper testing was done where it was as good as the Oppo DV-983H; see:
http://hometheater.about.com/od/dvdproductreviews/ig/OPPO-DV-983H-HQV-Test-Results/
Warning: The following is a large page that may take some time to load:
http://69.64.68.156/cgi-bin/shootout.cgi?function=search&articles=all
Please note, the Oppo DV-983H beat out everything else they tested for DVD playback, including some Blu-Ray and HD-DVD players.
It should not be be too surprising for the Oppo DV-983H to be better as an upconverting DVD player than a Blu-Ray player, as the DV-983H is Oppo's "statement piece" on how DVD playback should be done, and the focus of a Blu-Ray player is playing Blu-Ray discs, not on upconverting DVDs. They do, however, usually do a good job of upconverting DVDs, probably due at least in part to the fact that the amount of data on a DVD is very little compared with Blu-Ray, so processing power should not be lacking.
There are other very reasonable options, though, for just SACD and CD playback. Here is one:
http://cgi.ebay.com/NEW-Yamaha-DVD-C750-5-DISC-home-DVD-CD-Changer-PLAY-mp3_W0QQitemZ160242507235QQihZ006QQcategoryZ15077QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
It is "C stock", rather than new, but it is a fine SACD changer, and is less expensive than any Oppo. It does not have an HDMI output, so one must use the multichannel analog output for SACD. It also happens to be easy to make region free, and can convert between PAL and NTSC. But like the Oppo DV-980H, when converting from PAL to NTSC, it throws away lines of resolution. It does not upconvert (though it is progressive scan). The loading is very, very slow, and the remote is not overly user friendly. The quality of DVD playback is inferior to the Oppo DV-983H, which should not be surprising to anyone. I happen to own one of these, and bought the Oppo for better DVD playback. It is a fine SACD player, and I would never replace it for that.