Johns was not the first to put Steve Trevor on the sidelines. Trevor has had much less of a role in Wonder Woman books since Pérez. Trevor actually feels like he is more relevant than ever with The New 52.
Anyway, I asked this same question when I first joined these boards about a year ago (?). I highly recommend The Circle by Gail Simone and "A Day in the Life" by Phil Jimenez. Most people would agree that the beginning of Simone's run was good. It gets pretty ugly, pretty fast after The Circle though. Also, if you really want to understand Wonder Woman, you need to go back to her most definitive runs: Marston and Pérez. Her Golden Age stories are very much dated, but Marston had a very specific and clear vision of his character, which no writer has really done justice. And like you mentioned yourself, Pérez reinvented her for a new generation.
Also, Earth One by Morrison should be interesting. He has always had distinctive ideas about and insights into these age-old characters.