Yes, Deidre, this is a helpful topic and I too appreciate you bringing it up.
What Christian said is so important. Funny, not too long ago, I became a freelance report for a business newspaper and a contributing writer for two magazines. I was instructed to follow AP style book, which is what most publishers adhere to.
But I am a firm believer that, no matter which set of guidelines you go with, you can still keep your "voice," your personality, as you say. I only use the AP style book for the mechanics. For instance. does Internet have a capital letter or not (AP says it does), where and how do you use commas, etc.
Magazines are by nature more friendly, people-focused publications. But even with newspaper articles, it's possible to write in a style that holds the reader's interest. Frankly, I think more people would read newspapers if they weren't so "dry."
Christian, I think you need an editor who understands "voice" and can find and nurture writers who have interesting (even entertaining) things to say. And, yes, opinions. I've found that a writer with an alternate view on a topic, can engage readers and extend the thinking/interactions (ever read some letters to the editor?)
Two writers I managed in the late 1980s gave me The Elements of Style as a birthday gift one year. I still keep it close by. It's just a good, basic overview of usage, composition, form, and commonly misused words and expressions (further/farther, effect/affect, etc.) The last chapter, "An Approach to Style," actually gets into style in a broader sense: style that reveals a writer's uniqueness, that lets you write in a way that is most natural for you.
Wondering if your magazine has an online edition. Would love to check it out.