Absolutely love Abigail. Also really like Imogen and Martha.
Abigail Faith and Imogen Faith would both be beautiful.
Faith would be fine as a standalone I think. I know a little girl from a very committed Christian family called Grace. Other than piping up 'that's me!' several times during a sermon once I don't think she's found it a burden! 
Miriam is absolutely lovely. I'm not so keen on Elizabeth.
You both seem to have quite classic taste.
How about:
Annabelle, Amy, Beatrice, Bethany, Claire, Catherine, Edith, Esme, Eloise, Erin, Felicity, Francesca, Florence, Georgina, Grace, Harriet, Isabel, Jessica, Julia, Juliette, Katie, Louisa, Lydia, Madeleine, Matilda, Miranda, Mary, Natalie, Natasha, Olivia, Philippa, Phoebe, Sarah, Sophie, Sophia, Sylvia, Susannah, Tabitha, Thea, Victoria, Violet, Vanessa, Zoe, Zara