I've been listening quite a bit to this band (the german one, not the other "black metal" one) and i'm loving what I hear. I don't think i've listened to any other album as much as i've listened to The Heathen Chapters. Are there any other bands that sound a bit like them?

Try the Black Metal "Help" thread. You might find it useful to you to provide a brief description of what Svafnir sounds like (as opposed to just mentioning the name) when making your request, as one generally can't count on most people being highly familiar with any individual obscure band.