I prefer 44cm (c-c) bars. There are soo many different bends and drops on the market now that it is really hard to recommend one bar specifically.
As with all things in cycling there are soo many choice of options that the only real solution to choosing components is to test ride them or at least check them physically at a bike shop, this is one reason, of many, why supporting your LBS is such a good idea!
I personally use the Ritchey Biomax Pro bars. They give you more available options as to hand positions for long rides. And they seem to help the problem of numbing in the hands. I am also a climber, not a sprinter, so aerodynamics are not as important as comfort and breathing.