Photoshop and colour settings


I run with Scissors
My colour settings have just gone haywire and I need to know what colour settings other PS users are using in the RGB workspace? At the moment I have a blue/green mismatch between my monitor and the web view. I am using sRGB IEC61966 2.1 - is this the correct one?
What should be in CMYK / Gray/ Spot? And also in Colour Management policies for RGB, CMYk and Gray.?

Photoshop help on colour management went right over my head.