I have had more fun with the two H&Rs that I own than all the other handguns I own combined. One of my first handguns was a 929, it went every where with me for years. It is a good shooter and never failed me.
Now to answer your question. Although they are good little pistols, they won't demand a big price when selling. If your friend's gun is super nice, it may be worth a few more dollars, but in my area 125-175 dollars would knock it dead. :?