$100 and a sloppy joe says the 2 headliners this year will be Agalloch and Borknagar.
Kromlek is goooooood.
I'm extremely impressed by Manegarm's intense drumming, and also by the fact that their drummer delivers such an incredible vocal performance. I personally think the vocals make that band as good as they are.I just noticed how much I love Manegarms drumming. Please get them again! I'll give you a kidney.
How about the Brazilian Folk-Metal band Tuatha de Danann? They have three CDs out. A (Brazilian) friend of mine told me to check them out. I did and I like it. I can't understand a word of their official web site, but their MySpace page is in English. Or, you can read their Wiki entry for more info. If HC wanted to introduce fans to a wide variety of Folk-Metal bands, Tuatha de Danann might be a fascinating addition to the roster.
Thronar would be another excelent band for the HC3!! They are amazing!