Sorry, but according to proacman sacd and dvd-audio are comparable, this just isn't true in most cases. if you have avearge gear (read: low-fi and some mid-fi) this is true. however the more transparent and better performing your syste gets the more noticeable the gap between sacd and dvd-a, sacd wins hands down. on normal cd playback dvd-a have been reported as doing terrible and i can second this (tried it on panasonic ax-7 i believe is model number). while cd playback on scd-777 and dvp-9000 has been reported as not as good as some higher end cd playback machines at same price, it is very good to excellent (YMMV) in my opinion (i have a scd-777es) and can be output to a dac if so desired.
as for proacman's statement though take it with a grain of salt and come up with your own conclusion and listen for yourself, i think you can hear all three (sacd player, dvd-a player, and a regular cd player) at a local good guys store albeit with very limited upstream components but it should give you some clue. make sure to bring some familiar software with you and compare it on all three players.
yours in audio,
jayson