I had the DSPTM SACD but so far only listen to it once and not the whole SACD, the mixes are really good and with this thread, I am gonna take it out and listen again.
Another DVD-A to test the surround sound is Blue Man Group's Audio, wonderful demo material and if you wanted to test your sub-woofer for accuracy and speed, this is the one to get.
to source for SACD:-
http://dvdpacific.directtoustore.com/GlobalSearch.aspx?search=SACD&IMAGE1.x=0&IMAGE1.y=0and for DVD-Audio:-
http://dvdpacific.directtoustore.com/Music/Dcs.aspx?dcs=1&Format=DVD+Audio