You may as well throw out any names you don't agree on. Especially if you have some you do both like.
Personally I like Tahlia best to go with Gail, and I think all three boy's names go ok with Angus. I like Harrison the best.

Have you tried looking for variations of names you don't like, or both find too popular? Sometimes those classic names can sound a bit more exciting with the versions from different countries, for example.

Congrats on your pregnancy