@kalayaan:
For me it is still the japanese and original version of Ringu (The Ring) 1998
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Ringu is a masterpiece! I remember when I watched for the first time… OMG!
I watched the 2 sequels (Ringu 2 and Ringu 0) a little after, both are good but not as good as the first one.
After a long time I watched Rasen, the first sequel to Ringu, but it was such a weird experience, I understand why they pretended that this first sequel didn't exist and made Ringu 2 instead. Rasen changes the tone and makes the story something else, from the supernatural horror in Ringu we go to a sci-fi spin on Rasen. But it was a nice experience, something like a parallel world version.