Hi Harvey,
There was a typo in my post, I meant to type D120, not D140. But, you have answered my questions and addressed my concerns perfectly.
I very much appreciate your detailed information and timely response.
I will now buy buying some D123's for my rig plus a few more as spares since I understand getting used ones with good cones is cheaper than getting one re-coned. If you can even find OEM cone kits!
I was getting depressed because I couldn't find any D120's at anywhere near a reasonable price and you have solved my problem.
You and I have very similar musical tastes so I am confident getting them will be a very positive and revelatory experience.
Thanks again!