I am by no means a pet expert, so hopefully someone else will give their advice.

Here are two questions to consider[list=1][*]How old is your Choe/Corgi?[*]Is she spayed?[/list=1]
Both these questions could have an impact on which gender you should get.

Dogs themselves have to determine their hierarchy. Dogs of the same age, and if one is much older than the other, may lead to a shuffle in the hierarchy, so be aware of that.
If you get a male dog, and your other dog is not spayed, you may in the near future have puppies at your door.

These are just what I thought of, I am sure there are more things that someone else will bring up.