I would pronounce it Mia as MEE-ah. Mia is my mom's name and Esther is my MIL's name. I know Esther is somewhat of an "old person's" name but I have known several young girls with it and it seems quite feminine.
Thanks for everyone's responses. I especially liked seeing the anagrams! I was kind of curious if there were any negative ones so that is great! I will check out the other babyname board that was suggested. I have tried those types of boards before, but I wanted to get some opinions that maybe weren't so 'hormonal', if you know what I mean.