We'll the question is only in how many changes you have to perform to make PyCharm best fit to your needs and how many changes you have to do to make an editor be an IDE... At least to look like IDE. And one product as a solution is most probably always better than many (editor + plugins), because one product always more stable, more tested, provides a solution not a set of tools. And imagine the programming department which want the same tool for all developers - the best thing is to take a ready-to-use solution. Vim/Emacs are great, they solve "editing" task best of all alternatives. PyCharm solves "programming in python" task best.
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We'll the question is only in how many changes you have to perform to make PyCharm best fit to your needs and how many changes you have to do to make an editor be an IDE... At least to look like IDE. And one product as a solution is most probably always better than many (editor + plugins), because one product always more stable, more tested, provides a solution not a set of tools. And imagine the programming department which want the same tool for all developers - the best thing is to take a ready-to-use solution. Vim/Emacs are great, they solve "editing" task best of all alternatives. PyCharm solves "programming in python" task best.