The authentic thingie to power the 12s is the NAPS. But it may not bbe the best. My 160 does the job, too.
Looking at all my Naim amplification, I wouldn't part with the 12S, the 160 Boltdown and the Nait 1. Those are keepers. Sadly the other Naims don't do it for me at the moment: Nac 32, 62...