Speaking to some other owners of the NAT HPS, it seems like a common consensus is that it can lack some bass power but does have a really nice midrange and really fabulous detail, so a bit torn now.
I may end up saving a bit and looking for a demo set of Fyne 703s if I can track some down since I could likely get them for about the same as a pair of brand new Turnberries. The 703 is 94db sensitivity (not quite as good as the 704s, but still pretty good).
Recommended power into the 703s is 20-250w, so there's quite a bit to choose from.

