I have not heard the Naim. The McIntosh integrateds will have the typical "Mac" sound. The McIntosh will have slightly mild/laid-back midrange and midbass. The sound is excellent, don't get me wrong, but it is not a resolution monster like your Anthem. I think the Primaluna will have more resolution and attack/detail than the McIntosh, but it will not have the power. The McIntosh is not nearly as warm as the Parasound, but not as fast/detailed as the Anthem/Primaluna.
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In a comparison, the Parasound will have excellent "slam" in the midbass and midrange, but it will have rolled-off highs. The McIntosh will have pretty good resolution in the highs, but slightly rolled off midrange (best I can describe it). Both will have good bass authority.
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In a comparison, the Parasound will have excellent "slam" in the midbass and midrange, but it will have rolled-off highs. The McIntosh will have pretty good resolution in the highs, but slightly rolled off midrange (best I can describe it). Both will have good bass authority.