If you do want to listen to something by Tim Keller, then I think that the best place to start is here.
This is a free samples page from the church that he pastors in New York, and there is plenty to listen to. I’d recommend his because I find him both thoughtful and Biblical. He is someone who has evidently thought long and hard about the way in which we communicate the gospel to modern people while remaining faithful to the gospel.
If you want to read, hear or watch more, the best resource page I have found so far is here.