Hi! Well, as the title says, I lived in Fayetteville for five years (I just moved from there to here in Little Rock in May). First of all, it is a beautiful area of the state. Your husband will definitely have plenty of space to enjoy the outdoors. Secondly, it is probably one of the most liberal and open-minded areas of the state, even though NW Arkansas generally votes conservative. Fayetteville itself is a college town and there are some old hippies around as well. It seems strange that I never really got to know people in the formed liberal circles (I was busy with school), but they are there. Somehow, I identify Ozark Natural Foods as sort of a hub. It's a natural foods store that expanded in the last five years and is actually a hopping business now (I remember when it was in an old house off the square about 15 years ago--my parents used to travel 2.5 hours to shop there).
While I have not started a family yet, I would guess that it is a great place to have a family. Low crime, and the people are interesting and well-intentioned. It's not a huge city, but certainly large enough to have most things you'd want. The area itself is beautiful. There is a great park--Devil's Den--about 35 minutes away. There MUST be a vegan community, although again, I never really found them (strange since I've been a vegetarian since born and wanted to make friends that are similar). There was a vegan potluck club that met when I lived there. While I don't know specifically what buddhist groups are there, I am sure there are some. You could probably just check the message board at Ozark Natural Foods to find groups that meet. I'm sorry I keep mentioning that store so much...it's just that you will find a lot of the kind of people you're interested in either working there or shopping. As for the school system, if you would like to know specifics, I have several friends that are native to Fayetteville and went through the schools there. They still live there as well and I could pass along questions about the school system to them if you like.
I hope this is a little helpful! I would have messaged you, but I'm afraid I'm still in the dark about how to do some things on this site. Send me a message or post something here if you have other questions or want to talk more about Fayetteville. I am happy to pass along any info.