I believe Monokai Pro is the best one. I can't feel comfortable with other themes, and believe me, I tried. Colors are just great and fit right in the syntax, where other themes (some that you have mentioned) mix colors in confusing ways. Things are neat and understandable with Monokai Pro. Love it.
I used this as well, it's very neat. Though after a while I turned bored having such a dark theme so I followed Wesbos's theme Cobalt 2.
Found it in his podcast, SyntaxFM and been using it ever since. It's somehow a perfect pair programming theme as well!
I agree with you that sometimes it gets boring, that's why I try a lot of different themes, but there is always something in those that makes me feel uncomfortable with. So I end up always switching back to Monokai Pro.
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