While the "academic peer" argument tends to be used more than it should, it still has some validity. Idaho State University is a research institution, and it offers undergraduate, masters, and doctoral degrees (along with millions of dollars in annual research). You can look at various publications which "rate" institutions of higher learning, and you are able to see which schools are similar to one another. US News and World Reports is one that's often referred to, and they rank colleges/universities into various categories. ISU is considered a Tier 2 national research instituion (MSU & UM rank higher), and other schools within Tier 2 include Portland State, Northern Arizona, Northern Colorado, New Mexico State, and Louisiana Tech.
Division 2 schools are generally schools of smaller enrollments, and who primarily offer undergraduate (and some masters) degrees with less focus on research.
Academic snobbery aside

, what Division 2 conference would ISU compete, and what evidence is there we'd stay competitive (how do we know the budget wouldn't begin to decrease from what it is currently)? The RMAC isn't accepting new members -- Dixie State, a great geographic fit, was denied membership. The RMAC already has 14 members (10 who play football). The Great Northwest (which includes Northwest Nazarene in Nampa) also turned them down, because it already has 10 members (although they do offer football to affiliate members). In addition, the GNAC includes 2 schools in Alaska -- how will that help your travel costs for non-revenue sports? The only option ISU would have is the Pac West Conference, and Dixie State would be the closest member (with others in California and Hawaii). Again, ISU expenses for travel would increase from what they currently are, and I'd make a bet that gate revenue would sharply decrease from what it currently is as well.