If it were me,I would get the black,as it just looks better.The heat difference will be minimal.If you like the small size and light weight of the OM series cameras,you will love the OM-D.Getting used to the 4/3's system can take some getting used to.Olympus make some fabulous lenses,and the weatherproof lenses are a bonus for when you are out and about in the bush.
I don't have an OM-D,but I do have an E3 and an E5 and love both.


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