WSUGirl,
No need to post the same question in multiple forums. It just makes it difficult to have a coherent discussion.
Your school seems to be a pretty good candidate for NPC sororities. That being said, not every NPC is likely to be interested. If your school's administration decides to open up for NPC, the 26 member sororities will consider many factors, including but not limited to:
Prestige of the school
Graduation rate
Student population
Number of undergraduate women
Student body demographics
Available alumnae in the area
Presence of alumnae on faculty or staff
Availability of housing or meeting space
And many, many more factors
Some of these factors will be positives for your school and some negative. Having a few negatives does not mean NPCs won't be interested. It might mean that certain NPCs will pass, but others may take the plunge, especially if they a strong alumnae base in the area. The fact that your school would likely not require sorority housing is a big plus and will open up interest to more sororities. Chapters that require competitive housing are a much greater investment and a greater risk. There are several sororities that are particularly strong in the northeast and sort of specialize in smaller schools.
What you can do is discuss the matter with your school's student life office, and be persistent. Gathering interest from other undergraduate women enrolled full-time at your school will help your case. If your school gets on board, the process will likely be out of your hands. (In fact, a sorority could colonize and then not even select you for membership. Not a pleasant thought, but something to consider.) IF you are able to gather enough seriously interested women to form a Sorority Interest Group (which would be a registered student org), your org might have some influence in the process and the sorority which is chosen. Of course you could only choose a sorority which applies for consideration.