Hi all, I thought it worth updating as there have been a few changes to my system over the past couple of months.
First I added a powerline to the Uniti 2 - this certainly brought improvements to the bass response (much tighter and better defined). Moving the PL to the NAP 200 didn't change things much from having it on the U2.
I then purchased a 272 to replace the U2 along with another powerline. This was a significant step up in detail. I stated hearing aspects of tracks I had not before. Clearly a very high quality component.
Then yesterday I traded in my NAP 200 for a 12 month old 250DR. Only a few hours in but it sounds wonderful so far; I can't stop listening.
The X2s seem well suited to the DR and I must say I'm very pleased and proud of this system and am sure it will give me many many years of pleasure.
Thanks for all your guidance on this.