From my personal experience the best way to move gold is by using the guild bank and a vanilla account. You get a vanilla key, make a account, make a lev 1 toon, invite it into your guild and take the gold out of the guild bank.
After that...face to face trade has worked quite nicely for me.
I've found that a account has a certain "cap" of gold traded that will get it automatically banned. Its somewhere around 200-300k gold.
I've used vanilla accounts and traded no more then 200k...so far none of my accounts(farmers or vanillas) have been banned.