Opeth: I would choose blackwater Park if it were me.
as to Amorphis. Elegy is their first album that strayed into the progressive, not just melotic death. However my personal favorites are the last 3 albums, Eclipse, Silent Waters, and Skyforger, but as to which of those 4 belong on that list? I'm not surereally. I think if someone wanted to get into Amorphis having never heard them before I might recommend Silent Waters Its the one I got into first. As to defining their part in the progressive Genre Probably Elegy, but I can't get into it as much as the last 3 records, the vocalist isn't as good IMO.
Nightwish... I would personally choose Wishmaster, but that's just me.
so close, no matter how far.
9/21: Uproar Festival