The idea itself is great. The 'golden articles' should have its own 'tab' on the top of Kuro5hin, just like "Everything", "Diaries" and so forth.
I'm not that interested in having it posted to the frontpage, as that is for 'news' imho, but that is just me.
However, what should determine where it is put? In my opinion, it is the +1 to -1 score, and then the average score of the comments. I'm not sure how it should be weighted, but the comment ratings should really count.
If an article basically is a three-line question on how to solve something, and the comments are blood brilliant, all-rated-to-5.0 ..then its golden.
Also, an article can't become golden before it has been here for more than a week or something like that.