I have a bike with 44 cm wide dropbars. I can ride all day on smooth roads but when it gets rough my shoulders hurt after 20 miles. I measured my shoulder width at the boney part just below the top and it measures 47 cm. So I figure I need wider bars. 46 cm are fairly easy to find and relatively inexpensive. 48's are rare and are pricey and the only one I've found (Nitto Noodle 177) requires a new stem to match it's clamp diameter. So we're looking at $140 just to try it out.

So as I'm inbetween two sizes which way would you go?