beast from the east
Member
BWP to me is the album that best reflects the diversity of their style and sound, so I always recommend BWP first to Opeth "newbs"
Blackwater Park is definitely a great album to start off with. It's their 5th album, so it's dead center of Opeth's career releases. As for Still Life, I really never had a hard time getting into that. The toughest to get into are probably the first 2, Orchid and Morningrise (both are great as well).
Go with Blackwater Park since it's a very well-rounded album. After a little time with that, I'll guarantee you'll buy another. Then you'll be hooked. Enjoy!
On another note, you may want to pick up Roundhouse Tapes, if you're into checking out their live sound. It's fantastic!! Just putting that out there...