I've owned many K&B's through the years. They were all .40's or .61's though and usually of older vintages. They all also had Perry style carbs on them and several were "pumpers". I still have several of each including a reverse rotation version I have planned to put in a pusher so I can use a regular prop.
I also like OS engines as they do seem to tune slightly easier. Not too thrilled with Evolution motors, which, by the way, are a different brand than Evo's. Many people don't seem to want to pay attention to that fact.
http://www.evo-engines.com/ are good engines I've heard.