Please definitely go ahead with Alyson 2.  I see Alyson 1 as a perk.  I, for one, plan on using her maybe for head portraits since I already have some nice face morphs for her that I can mix and match with your Anastasia but will be using Anastasia for Alyson 2 most of the time.

And here's some unsolicited eye candy :) I find dynamic clothing for Antonia can easily be adjusted for Anastasia - well the loose-fitting ones at least.   Click for full size, she's worth it!

Oh and if anyone wants to make shoes for her, sandals would be great too.  Come to think of it a shoe pack would go into my cart immediately.