That's an old record. The current world egg laying record is held by a White Leghorn with 371 eggs in 365 days (see http://cafnr.missouri.edu/about/chicken.php).
I have brown leghorns and they are not doing to well this winter My speckled Sussex is wonderful layers out of the seven I have I get 6 eggs a day all through this bad winter we have. friendly as can be they are still pullets The 2 year old Sussex I have gave me wonderful chicks last year X,s 3 wonderful mother. Leghorns are very disappointing I was hoping for more out of them . Hoping It will change soon . I am keeping them all hoping to get more chicks this spring . I would say get one or two Sussex and see how they are for you. I like every thing about them .
They love the kids and act like kids them self so mischievous.