Selling my OM-D and returning to 60D

That's the thing, though - it's REALLY HARD to blow highlights on the OM-D. Apart from the great DR, it even has a "Shadow/Highlight" mode that will show you, in realtime, if you are blowing the highlights, and it can be adjusted to suit where you want it to show clipping. There's really no reason to be blowing highlights on the OM-D if you are making use of the tools the camera provides to prevent it, and those tools aren't present in any form on the 60D (or any other camera with an optical viewfinder).