L.Q.
I grew up in Abington, I've taught in Cheltenham SD (Elkins Park), and I live in Upper Dublin. There is a decent Jewish population in all those areas.
You may want to contact some of the local synagogues, like Beth Am (Old York Rd), Beth Or (Welsh Rd) and Temple Sinai (Limekiln Pike). They may be able to help you make a decision about the community that would fit you best.
I don't know much about Jenkintown school district: my first impression is that it's a small SD, as everyone I've known has attended either Abington or Cheltenham if they live in the Jenkintown/EP area.
Personally, I think your best bet is Upper Dublin for both the school district and the Jewish community. All these areas are diverse and, IMO, accepting of different cultures. You'll so well with whatever you choose.