Infernal Affairs 2-Disc Edition
I had to buy it, because the version i rented a few days ago was terrible, it had burned in subtitles with no option for the original audio track, and the picture quality looked like a crappy bootleg camcorder job. The new version i just picked up has the original contonese audio with legible subs. It was pretty cheap too, only 10 bucks. 🙂