Hi Bob,
I would not go with anyone of these keywords. You need people looking for treatment to come you your website. That way they will convert better. So even if the search numbers are few, your primary keyword should be
MS Treatment Boise
multiple sclerosis treatment Boise
MS treatment center Boise
multiple sclerosis treatment center Boise
MS therapy Boise
Multiple sclerosis therapy Boise
We have tried this and with good results; if you do not append the city name you can add geo metatags for the best local results.
However your website is more geared towards NLP. There are almost nil searches for NLP and MS together.