Recently started using the Gruvbox theme.
I love that it has both a dark and light option. It totes itself on being better at contrast than Solarized and I have to agree (well, at least it feels better looking at it).
For both the dark and light options I felt most comfortable with the
hard option for contrast. For dark, soft and medium where OK. For light, on hard worked.
Mixing it in withe Fire Code Retina and everything feels brand new.