I don't know if it's the best, but before some of last patches it was good:
See if they fixed back the EC dropping mobs around Shrine of Ancestors.
If they are, Sin can kill them fast, so they give XP (and EC) faster than GV.
Go blue named, or some PK-ers will try to vulture on you.
Meanwhile vote and get Super Level Scrolls. LOL
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I love FC, and I like to take lower lvl friends there. We kill everything inside:
from 110 to 122 in one run, plus coins for skills, plus I give them all mats.
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After some time every place may get boring, so mix and give accent to fun.
Enjoy.
