Last should be the Mercenary album, which to be honest was so saccharine and false that the very sound of it makes me sick to the stomach. One of the most bland and offensive albums I have ever heard.
Hvis Lyset Tar Oss is clearly the most influential and historically significant out of those, so I would recommend that. If you are a fan of the melodic death metal sound then I suppose an argument could be made for Carcass or In Flames; the rest that I recognize (1349, Behemoth, Opeth, Ensiferum) are more on the trendy side and I wouldn't suggest purchasing those without taking a good listen to them first.