I just found this sermon by Charles Stanley, Walking in God's Plan. It's a good look at the different types of "wills" God has, of the things we are responsible for and the things God is responsible for.
Such as God has a "predetermined Will" - events that God has predetermined that we cannot change, such as His plan to send Jesus to the cross.
But then there are things that God desires - His "desired Will" for our lives - such as His desire that all men to be saved, His desire that we obey and trust Him, etc. And we have a choice about following God in those kinds of things or not. God has given us the right and responsibility to make certain decisions in our lives, about certain things He desires for us. And our choices will have a real effect on whatever happens, on whether God's desired Will for our lives happens or not!
This is a good balance between God's sovereignty and our free-will, our responsibility to make choices.
