1. Both of the solos in The Twilight Is My Robe. The first one is my favorite, because it repeats, making it unlike any other Opeth solo. The second is also great. Lots of emotion.
2. The second solo in Deliverance. Very smooth transition... I especially love the last few notes, as the lead is the only thing playing. Everything else is silent!
3. The Leper Affinity. I haven't picked huge solos like Forest Of October and White Cluster because, as awesome as they are, the song just cuts off and the solo starts. The solo in The Leper Affinity just flows, while the drums support it.
4. The first solo in Wreath. I love how the last note leads you into the keyboards and everything slows down!