PROFONDO ROSSO/DEEP RED just edges it over SUSPIRIA and TENEBRAE for me....the two versions I own are pictured below.
The German 3 disc version is superb.....
DISC ONE:126 MIN DIR.CUT
DISC TWO DOCUMENTARY 105 MINS
DOCUMENTARY/INTERVIEWS ROME 2003 120 MINS
DISC THREE:SOUNDTRACK CD......which you all know is feckin superb!
5.1 DOLBY in GERMAN/ENGLISH/ITALIAN
and it's region 0 as well........