Thanks to both, Acoustiking and Propellerhead. I followed your instructions and it worked flawlessly. Not only it was painless (Avisynth scripting gives me headaches), but the result was gorgeous, flawless 24p footage that I can edit directly in Premiere Pro. Loved it!
I've been a long time user of TMPGEnc encoder for it's quality and simplicity. After I saw your post, I updated to version 4.0, and I am very happy with the results. Once again, thanks. Awesome stuff!