1) Anton Webern - Complete Music for String Quartet, performed by Quartetto Italiano. Quite complicated, but very enjoyable nonetheless.
2) Bruckner - The Complete Symphonies, performed by the Munchner Philharmoniker, conducted by Sergiu Celibidache. If you listened to - and enjoyed - Bruckner, you owe it to yourself to hear the Celibidache interpretation.
3) Handel - Ode For St. Cecilia's Day, performed by The English Concert with Trevor Pinnock conducting. Did I mention already that I can't write about classical music well? I won't. But do yourself a favor and listen to this CD - it's damn good :)