Kamurai
Really good watch, could watch again, and can recommend.
This shares a similar spoiler issue with Terminator 2, the adverts that try to make it interesting give away the "big twist".
Yes, it's low budget, but it does a lot with that budget. This concept is almost on the same level as "Fallen", it's brilliant.
The actors do what they can, and they're good, but I don't think they're great like the movie needs.
It has some great mystery elements to it, and is well worth the watch.