I was also a big fan of Spacegray Eighties, but I recently switched to Oceanic Next. It's similar (but with a blue hue), and is supposed to work better with JS Harmony.
I switched to Nil w/ the Big Duo color scheme about a year ago and since then no other theme/scheme looks right. To me, it's the perfect use of contrast while still pleasing to the eye.
Any other suggestions for somewhat minimal themes out there?