What are you favorite episodes that are NOT based on the manga?
Here's my list:
184: "A Cursed Mask Coldly Laughs". Probably one of the creepiest episodes, and one that was actually really well written for an AO. This one to me actually felt like it was a manga case, and I was very surprised when I learned it wasn't. This, as well as the other AO one hour special from the timeframe, 209's "The Entrance to the Maze" is another highly underrated story.
175: "The Man Who Was Killed Four Times". Probably one of the more fun cases in the show. I just love the absurdity of it.
88-89: "Dracula's Villa Murder Case". I especially loved how the guy dug his own grave by slipping up and saying he could hear what was going in when listening to sealed door. Another creepy case.
92-93: "The Fearful Traversing Murder Case". Very early in the show, there were some REALLY excellently written cases that were AO's. This one is definitely one of those. The motive was very obvious, but too obvious for you to put two and two together. And quite an interesting plot twist!
124-125: "A Mysterious Sniper Murder Case". Mostly nostalgic reasons for this one, as it was the first fansubbed case I ever watched.
161: "The Murder Floating in Ryusuitei". I love how the murder happened. So goofy that I can DEFINITELY imagine someone doing it in real life.
276: "Case of the Missing Policeman's Notebook". Love Takagi episodes, and this one is a classic. I love the shot of Takagi with his head down while 100 foot tall Megure-zilla is yelling at him and telling him that he's fired.
282-283: "The Mystery of the Water Flowing Stone Garden". I wish this one was available with better subs, than the crappy HK subs... it's a really fun case.
471: "The Out of Control Rental Car". I love Kogoro in this episode. He's just so calm and collected, even when he understands that he has to keep driving at that certain speed.
Everything past the 300's is either hit-or-miss. Some of my recent favorite AO's are the fireflies one that recently aired, and the two part case where Kogoro "gives up" the detective agency.
How about you?