I have Buffs, a Delaware, Ameraucanas, an EE, and a Wyandotte. They are all pretty mellow except the Wyandotte can be a stinker sometimes. But usually that's more towards me. She is not what I would call aggressive; just has an attitude and likes to make growling noises. She used to peck me but she has really mellowed after she started laying.
You'll have a much easier time finding EEs and they will cost you less. Plus not knowing what egg color you will end up getting is fun. I'm still waiting for my first EE egg. My first one has never laid an egg even though she is over a year old and the ones I hatched turned out to be boys.

Got some in the brooder and more in the incubator so I'll eventually get an EE egg.