OK, just checked, the area south of Dennis goes to Flora Singer ES. I think the area south of Dennis is nicer than north of Dennis. I don't know about neighborliness. You should compare the two schools, Flora Singer vs. Glen Haven and see what you think.
http://www.montgomeryschoolsmd.org/departments/regulatoryaccountability/glance/
That being said, I know one family in that area whose children go to Glen Haven and they love the school. But at the same time I don't read much about that school on DCUM or the moms listserve in Silver Spring.