What is the biblical basis for the phrase "God wants the best for us"?

"God wants the best for us" is a common phrase by Christians, but I struggle to identify with it. From the scriptures, I learned that what God gives us is good enough. I don't think it needs to be the 'best'. I feel that too many Christians are taking the word best too literally. They believe that there is only one best option that God would provide. Some churches extend the thought and only purchase the most expensive sound equipment or acquire the most expensive buildings because they feel God would give them the best. So I'm asking for biblical references to support the phrase, "God wants the best for us".