I agree that Ash will remain good for several years standing after it dies. Back before the EAB hit this area, I had a real tall one that stood above all the rest of the trees in woods. Was dead standing at least 3 years before I took it down. Was in great condition.
I been making firewood out of most of them so far, but, like you, I'm going to save some saw logs out of some of the strait ones. Will eventually mill them with the chainsaw. A number of years ago I bought some Ash lumber. Was going to make a table out of it. Never did, used it for other things. It does look alot like oak, just lighter. Excellent wood. I have been heating with Ash for several years now. LOL And several friends & neighbors that I sell it too also. Oak is still my favorite for heating, but I sure am gonna miss the Ash when it is GONE.