Extreme Metal

[Maka]

Plenty, what style are you after?
Many of the albums that got me into metal were concept albums- are you looking particularly for storyline concept albums or just any concept albums?

Both will do just fine, and I'll make sure to check out the names you listed within the coming days.

Depending on the styles for future references, I guess it'll fall within the following categories: Prog, power, death, black/viking. I like my fair share of melodic and progressive touches on music (though I'll say melodic death isn't 'spot on' my cup of tea, unless people mean the kind that's labelled as prog or tech).