The changes to Northern Cross Priestess no longer make her an Aria clone as she was when she first came out. This is a good thing and a bad thing. It just means people will want Aria more but she is virtually unatainable. One more thing to point out is that they are different now, but you can still only have two of either Aria or NCP or combination of the two.
I put one NCP in my deck just because of one think that is i think unique in IS. Cleansing flame. Awesome ability.