Passion is key. This is absolutely true. So let me ask you a question. Are you having trouble choosing because you're equally enthusiastic about all of them, or because none of them thrill you to your core? Because those are two very different issues with different solutions. If they're all blowing your hair back, try them out, like everyone said. If they're not, that's okay. It probably means they need some developing is all.
We haven't gotten into plotting vs. pantsing in this thread yet, but I think it's relevant. If this is your first major project, you won't know whether you work better with an outline or flying by the seat of your pants. You basically have to try one and see if it works. Either way, plenty of pantsers still plan ahead a bit. Even if you want to discover your story as you write, it couldn't hurt to do some background work, for instance, with your characters. You don't have to do character sheets and full backstories, but populating the beginning of your story and figuring out things like relationships, motivations and personalities can help you either become extremely attached to them or decide that they aren't the characters you want to spend months or years of your time with. A litle world building might go a long way in that same direction.
I'm a plotter. I work out a detailed outline and usually make some character notes before I start a book. When I wrote my first, I, like you, had too many ideas. I narrowed them down a bit and made five outlines. They were all interesting to me in different ways, but I kept coming back to one over and over, filling in more details and fleshing out the story. I cared more about the characters; I was more excited about the plot; it just stood out as the right project. Two books later, I now have over twenty outlines to choose from. (I'm not suggesting that you write dozens of outlines, by the way. It's something I do when I'm blocked or just procrastinating.) Some are far closer to ready than others, but there are two I keep coming back to. By the time I finish revisions on book 2, hopefully one will stand out more than the other.
Good luck with your decision. Remember, if you get a few chapters in and realize you're writing the wrong book, it's not too late to try another, just avoid the trap of constantly jumping ship for "better" ideas.
@Stuart Dren spoke to this. The Grass Is Greener Syndrom prevents a lot of writers from ever actually finishing stories. I know from experience. I started and failed to finish so many projects before I came up with the five outline plan. There are some writers out there who can pull off working on several large projects at once. Most of us cannot.