i'd use a 210/370 symmar converted to 370.
shoot wide open it will give you a nice softness
but not too soft or
if you have a portrait veritar ( 10" ) i would use that as well
use it wide open it is beautiful...
That will help you figure out the lens to subject distance, as well as any needed exposure compensation. Once you've figured out what focal length gives you the working room that feels right, I don't think you'll go wrong with any of the more recent offerings from any of the Big Four.