I haven't read Catton but it sounds like you would like Robert K. Massie. He's got a 2 part series on WWI titled Dreadnought and Castles of Steel, the first book focuses entirely on the political situation leading up to WWI, specifically the naval arms race, from the different perspectives of various persons involved. He really focuses in on each individual and gives their stories great personal detail. The second book is WWI from start to finish, focusing on the naval war between England and Germany. Really good historical books.
Massie also wrote Peter The Great, which contains a war and is also a very good book, and two other Russian history books about the Romanovs.
I'm going to go ahead and add Catton to my reading list now