My primary commuter has a 50-34 crankset paired with a 11-32 11 speed cassette. Right now, it the perfect range for me. I like to spin and average 95 rpm, generally cruising at 17-25mph on my commute (unless it is icy or snowing). My commute is mostly flat, with a few gradual hills. I mostly use the 50 unless there are mean headwinds, or I take the long way home with lots of climbing. I had a 46-36 and found I was spinning out too often in the 46.