There are a myriad of things to look at, and most of it is subjective.
I think all of our DO schools are outstanding. Attitude, climate, educational oppotunities, curriculum, costs, overall student impressions/thoughts, and overall gut feeling are just a few things to look for and should be attention grabers. I am from the Southwest, and so I wanted to go to a school that is West of the the Mississippi. My initial first thoughts, were to look for a school in California. I found two. One thing I really like about Touro University, is that they accept letters of recommendation from either an MD or DO, not DO only. They found it more important to receive a letter of recommendation from a physician that has known me for years, versus an hour. I appreciate this because where I am from, there are very few DOs around or available. My primary care physician, for whom I have know since I was eight, was able to write me a letter of recommendation for TUCOM...even though he is an MD.
DO schools in the West (TUCOM-California, TUCOM-Nevada, Western/COMP, TCOM, OSU, and AZCOM) seemed personable, friendly, and yet competitive to me...and they had really good stats on MCAT scores, board scores, good residency slots, and fairly descent hospital affiliations.
I finally decided to go to TUCOM-Nevada because of the booming opportunities available, the climate, the students/faculty, the growing hospital affiliations, and the dire need to produce good, quality physicians in an underserved area. TUCOM-Nevada's third year and fourth year students don't have to leave the state or travel far to do their clerkships. Most Osteopathic medical students have to travel away from home to do their clerkships. Touro University has a good reputation; is open-minded, and has a passion to teach, lead, and serve the community.
http://www.tucom.edu/nv/tunv.html
http://www.tucom.edu/
Costs are important, and TUCOM is in the middle range of tuition costs.
http://www.aacom.org/colleges/tuition.asp
DO School map:
http://www.aacom.org/data/cib/16-geographic.asp
AZCOM:
http://www.aacom.org/colleges/azcom.asp
OSU:
http://www.aacom.org/colleges/osucom.asp
TCOM:
http://www.aacom.org/colleges/unthsc.asp
TUCOM-California/Nevada:
http://www.aacom.org/colleges/tucom.asp
Western/COMP:
http://www.aacom.org/colleges/western.asp