Dropping in a sr or ca motor is the easiest way to get power in a 240 but the KA's are definently not a piece of shit motor and are actually in my opinion alot better then the sr series engines granted there more expensive to buil but i'd rather have a 2.4l then a 2.0l any day and besides that everyone has sr's theres nothing unique about it my brothers 180sx has a single KA and it smokes the hell out of my friends sr all the time drift or drag.so dont just go sr because its the in thing to do think about what motor is the best for your application and then decide.
btw you can see my bro's car at
www.geocities.com/drift_inertia
look for the link that says dan