Thank you all for your help-- with a lot of deliberation and advice taken, I ordered the pink. Now it just has to get here! Hurry up and wait, I swear.
The pink shirt isn't that purple-y odd color IRL. It is a deep hot pink, which surprisingly looks pretty good on me (it is one of the only colors I borrow from the deep winter palette successfully, I have dress that color). The mid-tone blues just aren't as flattering, and the dark blue is very pretty, but I have a t-shirt in a similar shade and the lack of contrast between it and the black seems to cry for more accessories and completer pieces, which I don't have in the right color palette. I do have a couple of scarves I could probably wear with the pink in a pinch. I like both the yellow and the tangerine, but worry they will be super traffic site harsh against black.
If I end up liking the shirt after a couple of washes, I will probably be back for more. I ordered one previously (in the wrong size!) but was pleasantly surprised at the fabric quality/lack of wrinkles. Also, the cut is good, with long sleeves and a fairly narrow waist and ample bust room compared to other brands I've tried. I will definitely wear it with only the top button undone. Bella, I did try the express shirts, but found they didn't fit right in the shoulders/arms/bust (when one fit the other two were small or huge).
I was glad to hear that so many ladies felt that it was a plus to express my personality and creativity with interview attire. Of course, I don't want to take attention away from what I say, but I think "neat and appropriate, but memorable/different" would be in my favor, since I am not the typical "ideal" hire for the position based on experience alone, but am uniquely well-qualified.