Live and learn, man. Dont beat yourself up too bad about it. Its happened to the best of us. Look at the positive, even though its hard right now, at least it was $900 instead of all the cash, and you prolly wont ever get scammed like this again. Yeah there were a lot of signs it was a scam, but excitement and ignorance will get in the way. Hope you catch him, good luck.
BTW, posts on talk dont count towards your post count, they only go up in tech