Glad to see someone connect our current state to what happened in the garden...man's will was only "free" before sin entered. A couple of points on what has been said earlier.
Take Paul , the self-proclaimed chief of sinners. First, his statement as being post-salvation. It is not credible to think that Paul is commenting on a life of sin after he was saved; like you and I, he only came to fully realize just what a great sinner he was when he had his eyes opened to what he was by nature. This is where the comment is coming from and I have no doubt he was using a bit of hyperbole as well.
Secondly, and of utmost importance, is this. To show that the unregenerate man CAN DO NOTHING BUT SIN God allows us to see the very best of religious man, a man who had "a zeal for God, but not according to righteousness" (like his nation). Here was one who really believed he was doing (by free choice, he thought no doubt) God's will in apprehending those "of that way", bringing them bound to Jerusalem, and witnessing to their deaths. His abhorance of what he did as a religious zealot brought forth, I do believe, that claim to be the chief of sinners. But it just goes to show that the very "best choices" that unregenerate man lay claim to is just "sin" in the eyes of God.
And here's another point. Only the redeemed has the ability to "choose"...the point being that the unregenerate does not possesss the new nature in order to do so...but the redeemed has two natures and can yield to the one or the other...this is one reason why Paul, in Heb 5, desires all (believers) to come to maturity in spiritual things, that we might "by reason of use (habit or perfection) have their senses exercised to discern both good and evil". That ability, lost in Adam, is restored in Christ.