Having owned all the Naim kit you have and are proposing, I have to agree with the majority here on the classic (sorry) amp upgrade route of, 202/200>282/HiCapDR>250(DR in my case)>252/SuperCapDR or 300DR, and so on….
You have a pretty good source which, IMHO, should see you through the amp upgrades you are contemplating.
The OP appears to have made up his mind to go 250.2/250DR (both of which I have owned) next before 282 and the only way to confirm if this (unorthodox) route is a good idea is to do the leg work and demo the alternatives (i.e. 282/HiCapDR first), in your system at home if possible.
I ran a 282/200/HiCap (with an NDX/Cuddly Toy then SuperCapDR source) for a while and found the 282 gave me so much more than the 202. The 200 had enough welly to power most real world speakers, including Dynaudios.
Good luck with your next steps.