I'll be voting for Pokémon Never Black & White because of its quite superb and well thought out scripts, as well as the very dark, philosophical (in some ways) and fantastic storyline which make the game more of a mystery to play, and the beautiful, solid graphics that make the game a more interesting experience.
I would definitely pay good money for it to play on any system, and I'll wait eagerly for its next release. ҳ̸ҲRichie, or SkOria (on WAH) is a very respectable ROM hacker, and I slightly regret not being able to translate the first beta on time, and leaving him to translate it wholely after I failed. I hope he wins the Hack of the Month. ^^