I think you should really take just about everyone's advice here. A lot of it is negative, but it really is helpful advice. I've been in your shoes before. I've been there multiple times actually, but each time I fall for some Angel sent from Heaven, reality opens my eyes to the cold, hard truth that the darkness kept hidden from me. I wouldn't say you're "obsessing" over this girl, but you are losing your grip on reality.
You're calling her wifey when you've barely said two words to her? Like I said, I've been in your shoes before. I've thought about my future with various "angels". I've thought each one would make a great wife, and maybe a couple of them would have. But they weren't as perfect as I was making them out to be. There was a very religious Christian girl I had fallen for. I thought she was too much of an Angel for short shorts...until she posted a picture of herself in them. I also thought she didn't curse. Turned out she just rarely did it.
There was another girl, that I wouldn't say I fell for (I just wanted to bang her), but I couldn't make myself talk to her. I thought she was just too attractive, and it made me nervous. I had so many opportunities to do it, but I p*ssied out each time. I was walking home from McDonald's one day, and we walked past each other. Didn't talk to her. I was walking home from school one day, and walked past her. Didn't talk to her. After the year was over, I thought, "well that's it. I blew it. I won't get another chance". But I saw her again at the next school I went to. Didn't talk to her the first couple of times I saw her. Until one day, I said, "I'm gonna do it today." I finally talked to her. It was the awkwardest conversation I'd ever had.
Control your emotions. If you don't, they control you. Nervousness prevents you from thinking straight, which is why its been so hard for you to approach her. Meditate.
You're remembering little things about her, not because of your amazing memory (hell, I have a photographic memory and can still forget things easily), but because deep down, you want to remember them.
Which is fine. Remembering little things about someone you want doesn't mean you're obsessing. Just accept the reason why you're remembering them. Like the others have said, I can't see this working out. You're too far gone in your own fantasy. Open your eyes. She's not as perfect as you think she is. You may think you know her, but the truth is you don't. How could you? You don't even talk to her. You're basing your opinion of her on what others have told you about her, or what little info you've found about her.
I'd like to say the more you get to know her, the more you'll come to realize she isn't the perfect little angel. But the truth is, I went through oneitis twice before I finally started seeing and accepting flaws.
There isn't much I can say that hasn't already been said. So, I've leave you with this. Keep talking to her, keep getting to know her, and ask her out. If she rejects you (once), accept it and move on. No more contact. And quit ignoring these other plates you have. Talk to them. Get laid. I can't stress enough how someday you'll look back and hate yourself for not realizing how this girl isn't as perfect as you once thought, and how much time you wasted on her.