AngularJS - Fast, cheap and good!
Proposition for a StackExchange - Code Golf challenge (http://codegolf.stackexchange.com/questions/26782/fast-cheap-and-good-choose-any-two)
HTML
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.0-beta.8/angular.js"></script>
<div ng-app>
SELECT ANY TWO :<i ng-init=t=[]><p ng-repeat="(i,v) in ['FAST','CHEAP','GOOD']"><input type=checkbox ng-disabled=t[(i+1)%3]&&t[(i+2)%3] ng-model=t[i]>{{v}}
</div>