DVD Audio and SACD are music only formats. DVD Audio is not what comes out when you play any DVD, you have to buy DVD audio cd's and you have to connect your player in a different way to take advantage of both DVD Audio and SACD. Unless you have a receiver that lets you utilize this feature then don't worry about it at all for now. If you aren't looking for this, you won't miss it.
Now that I've started confusing you I'm going to make things tougher. Most modern (within 4 or 5 years) DVD players will play Dolby digital and DTS encoded soundtracks found on today'sDVD's. Those are the two formats that are
by far the most common to come accross when watching movies. Almost every new release is in Dolby digital 5.1. Not too many movies are using DTS right now. If you see a movie that has DTS on it the odds are that it has Dolby Digital on it too (actually the odds are close to 100%). If you see a movie that says Dolby Digital, but doesn't say DTS don't worry about about it. It just means you can't watch the movie in DTS and you can still watch it in Dolby Digital. Not all Dolby digital soundtracks are 5.1, some are only stereo.
Leprkon gave you some really good places to start looking. Those DVD players are all highly regarded and range from $100 up. Personally I'd suggest the 841 that he mentions. It is 100% up to date with every input and output used on the vast majority of home theater stuff today.
If you need more info just give a breakdown of what you currently are using for a TV and speakers or whatever.
Hope we're helping a little. We mean well.
