Many thanks to Lei for pointing me to the LINK for the Behr paint selection tool. As I responded to her, I've made WAY too many trips to Home Depot to use this same tool at the store, but had no idea it was available online. Now I can look at the color pallets in the very rooms where I want to change colors and get an idea of how they will appear in THAT lighting.
Am I any closer to making an actual decision of what color to paint? Well, no. Some days I throw my hands up and say I'm just going to leave it the way it is. But EVENTUALLY I'll pick something new.