You might want to look at a trekking bar rather than a flat bar. Lots of different uses, one hand position may not always be optimal.
LBS might swap out for the price difference if bike isn't already built.
Also, look at the gearing, most of your riding sounds like a 44 or 46 and a 32/34 in back might be better suited than a 50 up front and a 28 in back