Recently I've built, as a side project and soon-to-be open source, a micro SPA [1] to learn React+Redux and for the interface I chose Semantic-UI [2]. There's a official React integration [3] that is really good and easy to use, and since I wanted to mix pure HTML pages and the app, it's ideal to use a React UI framework that doesn't bundle all the CSS into the components.

The Semantic UI React integration also doesn't need jQuery, which is a nice bonus.

I agree with the TypeScript suggestion. It's so good, and the VS Code integration is awesome.

[1] https://javascriptobfuscator.herokuapp.com/ [2] http://semantic-ui.com/ [3] http://react.semantic-ui.com/introduction