Comparison Which to upgrade to

looking to upgrade to a zturn mower front a riding mower currently have a JD and I am looking at the Husqvarna EZ4824 and the Husqvarna Z4623 ,the Cub Cadet RZT50 and the John Deere Z245 or the John Deere Z425, would like to stay with the Deere but some are telling me the 2012 models from Cub and Husqvarna have taken a great step to being almost as good as the Deere any help from those who have or are in the know would be helpful Thank`s daddyin92