try the Specialized BG Compact alloy bars, about £35 if you shop around? Easy to find in any Specialized dealer, very neutral shape with compact sizing
bar size is linked to bike frame sizing, in that smaller frame sizes will come with 40 or 42cm bars and larger frame sizes 44cm upwards. women's bikes will run smaller width bars than mens for obvious reasons
not worth bothering with CF bars unless you know exactly what you want in terms of size and shape, and have money to splash about (there are better weight savings to be had for the same money on a road bike..)
recently? I was running Specialized alloy bars, had an opportunity to upgrade to a Specialized carbon fibre bar in the same size at minimal cost
all I can say its a difference in comfort on rougher roads, rather than weight or stiffness.