Cca c12 is usually mentioned, the TRN ba5 is sometimes's mentioned..... What is meant by neutrality is sort of changing though. I consider a Harman tuning to be truly neutral in the literal sense, or as close to it as you can expect. In reality, classic "audiophile" neutral refers to flat frequency response, which really isn't neutral when human hearing sensitivy is taken into account but it is still the common parlance for now.
I'm like an anti expert here though as I hate classically neutral sets. The KB Ear diamond is a good example for me of what is meant by the new neutral, or harman-esque.