Evil Live - Yes, that is the same director who did Oldboy. Everything he does is fantastic. Evil Live is something about vampires.
The Good, the Bad and the Weird - Unfortunately I don't know more about this film. I love this directors previous films "A Tale of Two Sister" and "A Bittersweet Life". In fact if you haven't seen "A Bittersweet Life" go find it now. It is one of my favorites.
I have seen 3 Extremes. I liked it. Takashi Miike's is strange and a bit tones down from his usual work. Chan-wook Park's is great. Fruit Chan's is a bit unsettling. I've seen 3 Extremes 2 also but right now I can't remember how it was.
My favorite Korean film ever is still Oldboy. A Bittersweet Life is a close 2nd. My favorite asian horror/suspense in the last 5 years is The Host. That movie was one of the best monsters flix I've seen in a long time.