About dictionaries, Japanese character dictionnaries (kanwa jiten 漢和辞典) are the best : more characters, more words, more details and explanations. English dictionaries become insufficient when you reach a high level in Japanese. But of course, since they are in Japanese, you can't use them before reaching a high level. So my advise would be : if you plan to study Japanese for a long time, don't buy too expensive English dictionnaries, because you may not use it anymore after some years.
About the subject of the poll, "How many kanji do you know?", nobody has raised the problem of what "know" does mean. To each kanji is associated a form, a reading, and a meaning, but it happens often that you forget/don't know one of them. Even Japanese people don't know how to write some kanji, or some readings. Personally, I can read far more kanji than I can write, and I can understand the meaning of many kanji while I forgot their reading. And there are some characters I can guess the reading, but I don't know the meaning.
So I can't say how many kanji I know.