Where have you heard the Slayblade gets damaged easily? K2 isn't really known for durability issues and in my experience they're just as durable as every other board.
All your other boards are valid options as well but you have the disadvantage that you've never ridden them. Also, their camber profiles are very different from the K2's and you might just end up not liking those. I say go with what you know and loved.