(Keep in mind that everyone will recommend “their” seminary as the one that TOTALLY fits you :))
That being said, your choices sound pretty good.
Side by side, Seminar is not as academic as MR and Michlala, Meor seems to attract more of an in-town crowd (that’s not necessarily a bad thing, but it depends on the person), Michlala is different from the rest because it doesn’t call itself Bais Yaakov (though it shares teachers with the other BY schools). I don’t know so much about Ateres.
I think Machon Raaya would be a great choice because it is a Bais Yaakov, yet would allow you to find your own place within the “mold”. Michlala also has great BY-type girls, who are coming from a similar background as you, yet because it’s so large, there really is a huge range – personally, I was coming from a similar sitch, and it really helped to be in an actual BY where some things I wanted for myself were not even a question anymore.
Hope this helps, let me know if you have any more questions!