adpiucf - you hit it right on the nail!
I believe this has been said before, but fundamentally, most sororities are based on the same things. We want to foster friendships, encourage scholastic achievement, create and develop great leaders, give back to the community and create a sense of sisterhood.
A good 99.99% of NPC sororities have SOMETHING to that effect in their creeds/open mottos/etc.
So Scandia if you are basing your decision on websites and their creeds, I hate to burst your bubble, but that won't narrow down your search.
When you go through recruitment (at the college level), most women know that in a general sense, most chapters do about the same things (have sisterhood times, socials, philanthropy events, academic stuff). One of the things I have noticed is that a lot of their decision is based on their ability to connect to the women already in the chapter.
At a post-graduate level, it should pretty much be the same.
If you pick a sorority based on the cool pin that you get to wear twice a year, or the awesome ritual you will see at the very most once a year, you might as well put all 26 sororities on a piece of paper and pick one out of a hat.