Funny thing, paint colors. After many efforts of trying to get Sandy Hook Gray not looking orangey brown on my walls (from taking the R3 -red oxide- out, to adding white, to using only 50% tint), and essentially ended up making it a completely un-Sandy Hook Gray, we discovered something fascinating. My painter primed an area for me to test more paint colors on. He used Zinnser Cover Stain primer. I was so surprised, and delighted, to see that Sandy Hook Gray no longer looks reddish brown on the primed section of the wall. Yes, I repainted it on again as I was curious. It still has a brown tint but mostly reading green-gray which I love. No more reddish/orangey brown showing through. I thought that given my old house color being so light (BM Limesicle that has been washed out in 10 years of UV rays), I can paint the test colors directly without primer. But, boy, was I wrong. The primer made such a difference and shows the sample colors better without interference from the old color. I learned my lesson!

Sorry but gray by its very nature is not a warm color so really difficult to go with anything other than greige which to me is just taupe by a nother name and has too many undertones. I like a grayed green for a nice neutral. I find the SW pewter tankard very dead looking. The problem is your space will influence the tones of all those greiges so it is impossible to tell you waht you need as you are finding out.

My son is about to move into a home with a light gray living room and we found the paint can -- SW Gray Screen. It is a light misty gray without going blue or purple in the light there. It is one of the colors in the SW Perfect Colors link Yayagal posted.

We recently painted our entire first floor with SW Versatile Grey and I love it. It is very neutral and soothing, and IMO perfectly straddles the line between grey and beige, reading grey in some lights and beige in others. I can't tell whether it would work with your other colors but it is worth picking up a swatch.