Have you seen iZotope Spectron yet? Love that company...

The new plugin in FL Studio: EQUO is another extremely powerful tool in my bag of tricks since it allows you to send indevidual bands to a send channel... I just wish it allowed you to use more than a single channel (per band would be nice - and beacuse they're sends, it's not CPU intensive). That'd be close to the perfect spectral processing tool I reckon.