SOCHIEFS only saves 6 letters, so I can see it not being a huge advantage.
How many banners are we talking?
SOC.COM is taken.
SOCH.COM is both dumb and taken
PSOC.COM (please save our...) is available
Obviously for billboards and such you'd want the whole enchilada, but if we even want the option of putting words like "unsatisfyingly" or "credenza" on the banner, then every bit helps.