I went with Rattie. I was a believer in him before he was drafted, and I'm still a believer now. There's not a doubt in my mind that he's going to be a legit NHL contributor. The only question for me is how long will it take. I think Schwartz and Rattie were born to play on a line together. (As an aside, I could also see Rattie struggle a bit in the AHL. I'm not going to read too much into it though. Like Schwartz, Rattie is going to shine brightest when he's playing with guys who can take full advantage of his great hockey instincts.)
Jaskin is my runner up in this three man race. He needs to continue to work on his foot speed and short area quickness. He can do that at the NHL level just as easily as in the AHL, so it wouldn't surprise me if he hits the NHL full time before Rattie does. With that said, I think Jaskin is significantly behind Rattie on the development curve to his full potential.
I'm not quite as high on Allen at the moment as most others are. I would be ok with him backing up a starter at the NHL level, but I think some additional time in the AHL will benefit him greatly. My guess is that it will be another 3 years or so before the Blues even consider asking him to shoulder a starter's load. He still has quite a bit to prove, but he's on the right track. He comes in at #5 for me.