I take it by "foreign films" you mean films in a foreign language and therefore not Hollywood? If so then you should really look no further than Japanese and Korean Cinema. Some of the greatest movies ever made come from that part of the world.
I recomend looking for Ichi the Killer, Brother, Oldboy, Zatoichi, and if your stomach can stand the most depraved fucked up movie i have ever seen (and i've seen some nasty ones) seek ot "Visitor Q"
The original Battle Royal is brilliant also, But surely everyone has seen that one?
<a class="postlink" href="http://www.imdb.com/title/tt0296042/" onclick="window.open(this.href);return false;">http://www.imdb.com/title/tt0296042/</a>
<a class="postlink" href="http://www.imdb.com/title/tt0222851/" onclick="window.open(this.href);return false;">http://www.imdb.com/title/tt0222851/</a>
<a class="postlink" href="http://www.imdb.com/title/tt0363226/" onclick="window.open(this.href);return false;">http://www.imdb.com/title/tt0363226/</a>
<a class="postlink" href="http://www.imdb.com/title/tt0364569/" onclick="window.open(this.href);return false;">http://www.imdb.com/title/tt0364569/</a>
<a class="postlink" href="http://www.imdb.com/title/tt0290329/" onclick="window.open(this.href);return false;">http://www.imdb.com/title/tt0290329/</a>
<a class="postlink" href="http://www.imdb.com/title/tt0266308/" onclick="window.open(this.href);return false;">http://www.imdb.com/title/tt0266308/</a>