Need color advice for master bedroom

Need color advice for master bedroom
Hi,
I would like to have our master bedroom painted a shade of light gray or blue. The type of paint we will be using is Benjamin Moore Regal, so I need one of those shades if at all possible. In the past I picked a color that looked great as a sample but didn't look so good on the wall because of the light... I am planning to try a couple on the wall to see what they look like and decide, but I need to narrow it down to a couple first... The "look" I am going for is something with an inviting feel, airy, and not cold looking. The room doesn't have too many windows, but just enough day light in my opinion. The room is also quite large, with a high ceiling in a shape similar to this (the dotted line should be a bit higher)
==============
Roller Blinds|Blinds