I'd get something that's been designed around a flatbar (i.e. longer) rather than fitting a flatbar to a shorter frame designed around drops...
http://www.cotic.co.uk/product/roadrat#gallery
They're lacking in mounts on the fork though, otherwise they're excellent. My heavy hauling groceries bike is built around the previous generation roadrat frame and has been excellent; after I swapped the fork.
@hamrack started
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I'd get something that's been designed around a flatbar (i.e. longer) rather than fitting a flatbar to a shorter frame designed around drops...
http://www.cotic.co.uk/product/roadrat#gallery