Right now its a tough time to make gold...

You're best bet with 6 right now...
There's a 2k Gold Emissary quest up.. these are always easy gold...
You can do 3 of the patch 8.3 assaults per week which have about a 50% chance to give you 2k per character...
The Silithus transmog farm is good for 6..
The Nazmir spot can be done with 6 if you're alliance
I would check out babypowders videos on youtube too for lots of old world farms that can be done with 6...