If I were you I'd head over to the Home Decorating forum and ask this question. It gets a lot of traffic and the people there are very nice and helpful.

If it were me, I'd wait and save up the money until I could do the room all one color. I think accent walls look best when there's an architectural feature to show off. What other colors are in your home?

I'm not familiar with that color but did a quick search on easyrgb.com

Here's some complimentary colors it came up with.
http://www.easyrgb.com/index.php?X=HARM&E1=99.90&E2=121.96&E3=133.79#Result

If you're not familiar with the site, or for some reason the link doesn't work right here's what I did.
Go to www.easyrbg.com
From commercial tints to RBG (upper right)
Type in your color name and use the drop down to pick the brand/collection (BM Color Preview)
Click on "harmonies" and it will bring up a bunch of color themes.
I picked theme 1 which is gray and clicked on "Get commercial tints"
Use your drop down to pick your paint brand/collection (BM Color Preview) and hit start
It will give you four color names that are similar. I'd take a look at Gray Cashmere. I tried to copy and paste the link but it wouldn't bring up the colors when I tested it out.

Hope this helps!

Here is a link that might be useful: Home Decorating Forum

If the rooms have different exposures and different furniture and carpet, the paint will not look the same color.