It might be an idea to take a wander through any public gardens there are in your area, not that I would suggest you want to plant like a park, but taking a look at their good or bad hedges might give you some ideas? Also talk with your neighbours, gardeners love telling about their successes and failures ..........
Agree re escallonias, maybe try a mixed hedger to please you and the birds? We have hawthorne, roses, lilac, yew, fuschia, pyracantha, holly and others, they have all knitted together and look great - plus the birds like them all year round. (the yew was in when we came, with a row of laurel, one of my personal pet hates, so it went, the yew stayed, the rest went in over the next few years.)