Sometimes you get informations about sound quality.
Unfortunatly the page is mainly in german. But if theire are any questions, I am from germany, so I may help you in some translations ;)
So far the "must have" foreign DVDs with more than the US Version are
Kill Bill (Vol.1) from Japan (R2 / NTSC) with full Color fight and so on
Grindhouse from Japan (R2 / NTSC) so far the only Grindhouse on DVD release :()
In France they have the only unrated DVD release of "Red Scorpion" but this DVD is just in french, with no subtitles :(
As far as I know France is the only country with a little bit longer "Killing Zoe" release.
Ans France has Longer Versions of "Black Mask" and "The Killer"
But French movies ofen lack of english audio and/or subtitling :(
In German theire is the only Russian Theatrical Cut release of "Night Watch - Nochnoi Dozor" (as far as I know.. and I don't know everything) outside Russia ans Russian related countries
A german comparison between the International Theatrical Version and the russian Theatrical Version can be found here: http://www.schnittberichte.com/schnittbericht.php?ID=2891
The russian Release is also availible on DVD in Russia and Estland with englisch subtitling.
(the german release also has only russian audio with subtitles in german, english for the deaf and hearing impaled)
The Movie is Called "Wächter der Nacht" in Germany (so you will find it ;) and look for the DVD containing the "RUSSISCHER DIRECTOR'S CUT"
(Amazon Link
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Edit:
Good Versions of "Ong Bak" and "Warrior King" can be found in UK (PAL R2) theire where the Thai Versions released, and not the International shorter Versions.
In Hong Kong (NTSC R3) the Director's Cut of "Fearless" (About 140 Minutes running Time) has been relased (in Europa theire is only the 100 Min international Cinematic version)
A good Release of "Bullet in the Head" comes from UK, with good Picture, but the Hong Kong Release does have some mor scenes included in some bad quality, but they are never released anywhere on DVD before...