Try a 14 tooth front sprocket with the 49 tooth rear, this is cheaper, easier than changing the rear and keeps the chain from wearing the slider, its a win, win.
I run 14-50 for mixed riding and little to no highway riding, I tried 13-50 but found first too slow to use much at all and 6th too slow on the road too, 13-48 was alright too and just a little lower geared than 14-50.