Ember is an excellent choice. We use it in a real large scale project and really love the 'addon' way of managing modules. Its simple and comes straight out of

Ember is an excellent choice. We use it in a real large scale project and really love the 'addon' way of managing modules. Its simple and comes straight out of the box. Our teams follow BEM for css and maintain 1:1 for a component/route and css file.