Opeth rocks so hard! You've convinced me to give the newer stuff (Heritage and beyond) another try. Ghost Reveries, Watershed, and Blackwater Park are the go-to albums for when I'm feeling Opeth, and would love to expand on that.
Also curious, any Devin Townsend fans in the house? Either old with Strapping Young Lad, or new(ish) with Devin Townsend Project or solo work?