Going to paint our 2000 sq ft house (inside) starting Saturday and need some advice. I have a bias towards using KM or SW paint under the perception that both are better quality paints than what you can buy at the box store, but it's not based on any data, just perception. Through work I can get our corporate discount at KM, which gets interior flat down to around $28/gallon. Looking through the latest Home Depot circular, their equivalent is on sale for $20/gallon. So, is there really a difference? Is it worth the premium?