I really like Sherwin William's Duration paint, but I've also heard good things about Benjamin Moore. I personally wouldn't go with the Valspar. My fiance and I painted our master bedroom using Valspar, and I don't think it looks nearly as nice as the other rooms in our home (which were all painted with Sherwin Williams). The finish isn't as nice. We'll be redoing it with either Sherwin Williams or Benjamin Moore.
The downside to Sherwin Williams is that they have less colors to choose from, and in my experience, their color matching isn't very good. Benjamin Moore offers many more colors.