If you enjoy ethical and philosophical aspects, you should look into international aid and intervention. Check out "Adaptive Preferences and Women's Empowerment" by Khader and work by Nussbaum in regards to social justice. These are some great texts coming off of reading Hayek.
If you aren't familiar with the concept of adaptive preferences, it is the idea that preferences may adapt to circumstances of deprivation.
Other readings I suggest: Creating Capabilities by Nussbaum and Robust Political Economy by Pennington.
Coming back to your question on Keynesian texts, you have to start with "The General Theory of Employment, Interest, and Money", it spends quite a bit of time trying to prove the soundness of the inflationism and labor unionism components of contemporary economic policies. Written in the midst of the great depression and the New Deal by FDR it seemed to be the correct approach for the time.