I have never been a fan of Naim speakers, hence I can't say which amp I prefer with them.
How ever I listened many time to Chris Bell 552/500/DBL in Seattle
I have listened to the 552/500/NBL as well, in UK
But you know I'm a Sonus faber fan
I listened only classical music and jazz...
As they say each to its own. What matters is to be happy with our own choices