I vote for Hypo A. Maybe Ultramel, but, then, I'm not good at telling the difference between those two. At the very least, a hypo gene is definitely involved.
BTW, from what I understand, Crimson is just selectively bred Hypo A--bred to have little to no color on the background, much like Miamis and Candy Canes. Not their own genetically-based morph, and, without knowing its background (genetics and appearance of parents) you wouldn't know whether yours can be considered a Crimson or just a Hypo A until it grows into its colors more. Not sure if you're already aware of that, but no one has mentioned it so far...
Lovely snake, and congrats on the new addition. Better to take a chance and get the snake of your obsession than to risk passing it up... I once fell in LOVE with a gorgeous, brilliant red amel zagtec at Petsmart but didn't jump on it fast enough--s/he was gone by the time I decided to just buy her. I still look at the pictures I took of her the last time and regret not jumping on the opportunity.
(On that note, the employees didn't mind my taking pictures at all. It probably helped that I already had a good rep with the employees on duty as a total snake lady, but I also made it clear that I was taking pictures because I was interested in buying the snake and just wanted to get some other snake keepers' opinions beforehand.)