Tekton Mini Lore with vintage NAD 7225pe?

I have been using the same system in my bedroom that I first bought over 25 years ago. I want to replace the speakers now, and get a new amp in the near future. The room is roughly 15’ by ‘15. Not looking to play at high volumes, just looking for something with great separation and clean sound. Looking for any opinions from anyone who owns these. And will the NAD work with these or should I get an integrated amp at the same time.  which amp would you recommend in the 400-700 dollar range?