Preamp to Pair with NAD M23

Hi everyone,

I recently got a NAD M23 to replace an Adcom GFA-555 that I've been using the past 10 years.  I am using a Bryston 11B as a preamplifier currently along with an Arcam irDAC to drive a pair of Kef 104/2s.  Overall, I am pretty happy with the sound but am curious about newer preamplifiers.  The sound stage and imaging with the NAD is definitely an improvement to the Adcom especially at lower volume levels.  I have been looking at the Benchmark HPA4 as a potential replacement and using the Bryston as a phono preamp.  For anyone with experience with any of these components would a major upgrade or more of a lateral move as I understand that Bryston and Benchmark are both known to be fairly neutral.  Any other suggestions are welcome as well.  Thanks.

Andrew