Yes, ef, definitely. The last episode (7) was a complete masterpiece.
Other notable works include, but not restricted to:
Shakugan no Shana Second [SS-Eclipse are good]
Clannad [Eclipse again- Widescreen releases are about 4 eps behind SD releases]
Gundam 00 (get Menclave's HD for utter goodness)
Ghost Hound (first three eps were background info, lil slow, but ep 4 picked up well. Recommend Genjo HD)
Myself ; Yourself, light anime with dark undertone. [m.3.3.w releases are good]