When hadith contradicts Quran, I discard it in a heart beat. I don't care if it were prophet Bukhari or prophet Muslim who narrated the Hadith. The quran clearly says that satan and his diminions see us from whence we cannot see them. End of story.
I believe 100% percent in the Quran, althought i don't understand certain things in it (and i think i never will). As for the rest: Hadith/Tafsir/Jurisprudence, I believe it's an utter mess, but that doesn't necessarily mean I reject them entirely.
How do you know the Quran is perfectly preserved? (Sorry, I bet you've discussed this many times before in old threads.)
Also, the fact that you are prepared to discard a Hadith in a heart beat if it contradicts the Quran surely means that you should not really pay any attention to Hadith at all.