Assuming you find no fault with your older guns why not add an old 20?
All my Wingmasters are plain barrel guns from the 50s with corn-cob forends and fixed choke barrels. They are very light, swing easily, and are a pleasure to carry. The modern WMs I've handled seem clumsy in comparison. Personally, I've no reason to buy a newly manufactured WM when there are old ones available at a similar price. Regarding choke tubes, I own several barrels for each gun and simply use the barrel I believe best will suit my days hunting. Might not be ideal for everyone, but it certainly works for me.