Having owned Kerries off & on since the early 70s, and bred a few litters, my advice is to forget the Off Lead Parks if you decide on a Kerry.
As Showdog pointed out Kerries were in the main feistier 15 years ago, and I believe a lot of the aggressiveness (towards other dogs) has been bred out of some lines, but not all of them. I have never met one yet that was not a wonderful "people" dog, but the Kerry Blue is not a dog for everyone. I see you are in Victoria, and would be happy to talk to you further if you want to contact me privately. Many years ago I also owned a couple of poodles, miniatures not standards, and they were a totally different personality to the Kerry Blue.