Keep the DE and save for another .45 or give Bob Serva at Fusion Firearms a buzz. He can fix you up with an upper, match barrel and bushing, front and rear sites, etc... The 10mm is experiencing something of a resurgence so don't worry about hanging on to a dead caliber. You could also do what I plan to do with mine. I'm getting a match barrel and bushing from Fusion in .40S&W so I can shoot for less $ and be able to scrounge brass at the range. Have a good day and keep your powder dry.