Hi Nicholaj
In all fairness the separates route will get more from the NAP 300 DR however the NAC-N 272 is still strong enough to be paired with the NAP 300 DR. The NAC-N 272 only gets stronger when it is energised by the excellent XPS2 DR or the truly remarkable 555 PS DR. Fwiw, over the last eight months or so I've mostly paired our NAP 300 DR with a NAC-N 272/555 PS DR and also this week until yesterday evening with Sopra 1's 
NAC-N 272/NAP 300 DR/XPS2 DR is a fab combination. 555 PS DR adds the icing on the cake 
All the best
Rick @ Musicraft
Thank you Rick and for that matter all of you whom have taken the time to share your experiences and insights on the topic.
I have to say, what a great and insightful community this is!
For me, a clear picture has formed in my mind and I can't wait to audition the 300/272 combination with the XPS and 555PS. If the 555PS delivers sufficiently, I suppose my dealer will be just as thrilled as me, as I will have to take the plunge...