Can't remember if threads have been done for these. Anyway...
Primer - A Sundance film about 4 guys that do some scientific experimenting after work. While working on a promising project, a new discovery is made that allows them to change their lives. It can be really difficult to follow due to the use of physics lingo, paradox, who's who, etc. Rather than boring you it makes you want to pay more attention in order to understand. Really good movie for the VERY small budget it was given. Don't bother putting down the remote and keep your finger on the rewind button.
House of Flying Daggers - This is Zhang Yimou's next film since Hero. It's a good flick with great action scenes but it is ultimately about love and betrayal. It does have a little of the cinematic beauty of Hero but it compares more to Crouching Tiger. Some scenes are a bit too long and it's easy to see the plot twists coming. Still, it's worth renting.
"The nose of a mob is its imagination. By this, at any time, it can be quietly led." - Edgar Allan Poe
"A person is smart. People are dumb, panicky, dangerous animals and you know it." - Agent K