I saw a 3 column one in (I think) the Lakeland catalogue yesterday - unfortunately it was a couple one with two wide columns and a thinner one headed Birthdays. It also had little pockets on each month for invites etc. I was tempted, despite the couple bit.
Just have a hunt around a bit nearer to xmas, I am sure there will be loads - at the end of the day a 4 column one, with one of the columns for birthdays would work well.