pastorbobnlnh 

Good question. Gearing for a particular bike is usually a matter of;

a) location
b) rider's fitness
c) amount of weight to carry or haul

If you live in a flat area and generally want to go with a high pace, consider something like the old fashioned "half step plus granny" crankset. Use the Ultegra crank and replace the the 39 with a 48, for a 52-48-30. This way if you encounter light to moderate winds the 48 tooth provides the lows you will need. When you come to a hill, the granny gets you up the climb.

Best of luck with your build.