Do whatever you want.
No, seriously. First step of any fanfiction is to think of an idea yourself. Otherwise, while it's perfectly possible to do request fics, it's just not quite yours, if that makes sense. As in, you'll be asking us to write a story for you.
So, here's what you do:
- Take a blank piece of paper.
- Write down all those concepts you came up with. Maybe even more.
- Write down as many details as you want about each until one of those concepts seems like an awesome story that you want to spend a lot of time on.
- Go with that one.
If you're asking us which one we'd like the most, to be honest, I've seen so many of each of them that it really doesn't matter to me. While I'm not saying you should ditch them and go with a different concept, I'm just saying it depends on how you do it, and chances are, you'll have readers regardless of which one you choose.
Yes, this isn't helpful, but I always like seeing the writer come up with ideas themselves. They usually end up more satisfied with what they produce.
That and I am (and, doubtful, anyone else here is) not a muse. Intentionally, anyway.