I should add that I acquired a brand new C326BEE while I owned the C372. With the C326 I could hear a difference in the approach NAD took when they upgraded from the "2" series, and it was an improvement. Clearer more open sounding than the C372, which sounded a little 2 dimensional and laid back by comparison.
So it would depend on the speakers used, but I preferred the newer NAD line up. The C375BEE would be a solid improvement, they've moved it up market where it now sits at $1499 new vs what the 372 was at, $899. I found an old used ad for a 375 at 950, so not exactly cheap, but I think you'd have to spend considerably more with separates to get beyond the bang for buck level of the current NAD integrateds. YMMV.
So it would depend on the speakers used, but I preferred the newer NAD line up. The C375BEE would be a solid improvement, they've moved it up market where it now sits at $1499 new vs what the 372 was at, $899. I found an old used ad for a 375 at 950, so not exactly cheap, but I think you'd have to spend considerably more with separates to get beyond the bang for buck level of the current NAD integrateds. YMMV.