I'm holding onto the three disc DVD set, as a couple extras got dropped for the Blu Ray, or were put into that iPhone app I'll never be able to use.
The LDDB listings mention three different ratios:
http://www.lddb.com/search.php?search=holy+grail&sort=title
I'm not that fond of the 2001 re-release soundtrack remix, as they added music and effects that weren't there originally. Unfortunately, if you catch a theatrical screening today, that's the soundtrack you get.