Speaker experience/recommendation for CJ Classic60SE

I have an opportunity to replace an old CJ  MF200 w/ the above for a very favorable price.  Not my primary system - CJ PV11 and Mirage M5si in a teaching/music writing studio but wondering what a more modern speaker might be better suited to the Classic 60SE. Of course it may make the Mirage even better,  it's still an interesting and engaging speaker

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Reference 3A De Capo BE ?

On the other end of the spectrum maybe ATC SCM19 v2.

The new amp may not have quite enough power power to drive the M5's. If you don't have a big room and listen at high volumes, you'll probably be OK.  If you do a lot of off axis listening, you may want to keep the M5's. If not, the Vandersteen Model 1's would be a good choice. Easier to drive, and they do things the Mirage can't do. But they have a sweet spot, and if you're not in it the difference will be noticeable.