NUGEN Audio Focus Bundle
Artists use this
Great for cleaning up the stereo image
After I do all my various processing during the creation phase of a song, I turn to these plugins for fixing the stereo image of a track as needed. I particularly love Monofilter for summing all my bass frequencies to mono & Stereoplacer for placing the higher frequency content of a given sound in different parts of the stereo image (both are invaluable tools for de-cluttering a mix).