Anji is an instrumental written by Davy Graham, a great English guitarist with rather unfortunate habits, which he recorded on an EP called 3/4AD in the 60s. There is a version on one of the Simon and Garfunkel albums, and it was Bert Jansch's favourite last tune when he played live. Dave Evans is a guitar player and luthier from Bristol who lives in Belgium, and is famous for very tricky instrumentals. Go to Amazon and search fingerpicking, and something will come up with Dave Evans on it. Rick Schoenberg is one of the mightiest fingerpickers in the USA. So is Dave Laibman. If you want something even more stimulating, try to find a tune called Under the Rubber Eagle (hint: that's a translation of the German slang for Kentucky Fried Chicken).