A light but featureful alternative to omz is also the grml zsh configuration [0]. I've been using it since 2011 or so and I've probably touched my .zshrc once or twice. If you fancy some colors you can also add some syntax highlighting [1]. Or just use fish which is great for interactive use!
[0]: https://github.com/grml/grml-etc-core/tree/master/etc/zsh