@desiringonlychild I agree with @SomethingNastyInTheBallPool , definately a step more suburban than E Finchley although plenty of cultural and ethnic diversity still, it is London after all! Just that most people are there for the exact reasons OP is looking, wanting substantial houses with gardens and big schools, so it does tend to mean more predominantly families and older people, whereas in E Finchley I think you tend to have more young couples and maybe houses of young professionals sharing in the mix?
There are more shops other than the spires, there's a high street but it's more useful everyday shops like Boots, banks, post office, charity shops than 'naice' organic cafes and artisian bakeries if you see what I mean? And the spires itself is, ahem, compact, no patch on Brent Cross or Westfields as a shopping centre either 
Most people would pop down to Muswell Hill or Highgate or Hampstead if they want upmarket (none of these are far away at all, within cycling distance or a short bus ride), or into central (which is hardly far away!) for clothes or 'special' shopping beyond their everyday needs. But Barnet isn't a total desert, there are some good small theatres and music venues dotted around the place, lots of great small food shops (just not fancy ones), pubsl, there's the everyman theatre which is good...