Anchorhead - seeing as you liked SOTME and are enjoying the Radio Drama, you should probably give the original "Han Solo" trilogy a shot. It only features Han and Chewie from the "known" characters, all three books came out before ESB hit theaters and, like the Radio Drama, was written by Brian Daley. I think he really captures Han's voice and the feel of the "Big Galaxy" era that ended with Vader's revelation at the end of ESB.