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The 60D/6D combo, for the non-action-must-have-best-AF-FPS shooter seems like a pretty nice kit. Pretty much the same control layouts, light weight, the combo wheel/joystick, both use SD cards, etc...there's even the 60Da for the astro shooters.
I've wanted a DSLR with an articulated screen, the G12 has one and it really helps me a ton. The WiFi of the 6D will do/help much the same, just untethered so to speak. The older I get, the more I'm liking lighter gear and IQ wise both bodies hit the mark well.