Hi!
I was also looking into a 5- or 6-disc DVD Player and found out that only few allow you to program across DVDs; mainly ONKYO.
I did a search on eBay and bought 2 ONKYO 6-disc DVD players at about $80-$90 each (second hand but in perfect condition). Multi-disc DVD players are non-existent in the Greek market so I thought "just to be on the safe side, get two..."
Even if you don't get to program across DVDs (some of Cathe's have too many chapters- e.g. Gym Styles - and you can only enter about 34 chapters in one program) you can always move to the next DVD while you get a sip of water or move your bench or weights around.
I found out that programming a series of exercises across, say, 3 or 4 DVDs takes almost as long as doing it manually after you're through with a DVD.
In any case, using a multi-DVD player is definitely worth it - time-wise and usage-wise... Imagine what it does to the mechanism when you to open the DVD tray 4 or 5 times every day...
Besides, you can put up to 6 DVDs in them to schedule a whole week's rotation; that's what I do, anyway...
Have a look at these:
ONKYO DV-CP704 (this one has an HDMI output and is the latest model), and,
ONKYO DV-C600.
HTH,
Chris.