Deliverance is the shit. I would suggest Blackwater Park and Still Life for the next exploratory glances. If you still want to go further back into their discography, there's plenty more.
I'm guessing you haven't checked out their mellow album, Damnation? Very different, but really good song writing.
A lot of people in the states got really into Ghost Reveries, which has some really good songs, but personally, I think they hit a kind of crescendo with Blackwater Park and Deliverance. Not to say that Watershed isn't a great album.
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