All of Edgar Allan Poe's works collected into one hardcover volume. This book has a lot of stuff in it, and I still haven't quite finished it.
I guess what sets this book apart from all the other collections of Poe, is the book itself. It's not annotated, but I couldn't find any collections of Poe that were; however, it does come with a great introduction. And after that, pure Poe. The book is very sturdy, and considering it's price, a great bargain. I personally can't stand the see-saw cut pages that a lot collections like this get, but this book lacks those, and that makes me happy. I also won't waste your time trying to convince how great Poe was, since the fact that you're browsing here means you already know, or at least have a clue.
While any collected Poe book would probably suit you just fine, since there is very little to distinguish them from each other, I would recommend this one, simply because when I was browsing through the various collections, this one appeared to be the best bang for my buck.