The color we decided on for this room is Passive Gray by Sherwin Williams. However, the store that we purchased the paint from did not carry Sherwin Williams, so we color matched with a Dutch Boy base. We got an eggshell finish to keep any imperfections camouflaged and we opted to get a paint with primer. However, we are going to prime the downstairs before using this paint. (NOTE: we are not experts at paint AT ALL, but this has worked well for us.) If we do need to get touch up paint down the road, I will be sure to get the same base. I am sure that color matching isn't always 100% accurate, and I am sure that bases differ. I plan on keeping a detailed list of the paint in our house binder, otherwise I will forget!