That list is rather Networker heavy, though judging by your username I would imagine that you are a little biased in your choice!
The NRM only have a limited amount of space in which to securely store and to display items of historical interest and their problems over the last couple of decades with having insufficient space to keep all the items of the national collection as would be fitting of their historical importance have been well documented , so their should be a very selective attitude to their future preservation activities.
In the future, IMO the NRM should look to preserve 150001, 165001, 465001, 59001 and 66001, as well as a class 92.
I think that if anyone were to preserve an entire HST set, it would be the 125 Group we would be looking to, and the NRM would be more likely to take on just a single production power car; 43002 or 43198.
I was extremely disappointed that the NRM refused to take on 56006 when it was offered as not being historically significant enough.
It's been known for some time that 58050 was destined for a place in the National Collection, I am however very surprised that the NRM wish to take on
two DBSOs, what with their limited space for storage and display outlined above.