MSMMO.COM - I just concluded a transaction with them for 10,000G (plus bonus, be sure to ask for it).
I went to the site, and asked if they had gold for me. They said on Alliance they didn't, but we could do it thru the Neutral AH. I went ahead and ordered after I asked for a discount. They gave me a code.
The Operator stayed on me the ENTIRE time thru the transaction, and I got my gold within an hour.
I was very satisfied with the service they provided, and would certainly buy from them again.