I own a lot of buckling spring boards, and recently got a Ducky with Greens. Nothing compares to Model M buckling springs except for Model F buckling springs. The greens felt good, clicky, very snappy and brisk -- but requiring not nearly as much force as people claim, but still less than a Model M. I then got MX blues and they feel okay, but wimpy compared to greens.
Just buy a Model M, they're available.
I thought MX Whites were just MX Greens without the click. Correct?