I have never heard the Nu Vista, but I own a Tri Vista and it ROCKS...I have owned Sim Audio, Rowland, McIntosh, Tandberg and a couple of others, the Tri Vista is the most musical and warm unit I have ever run across. It has lots of power so if your speakers are not the most efficient on the planet...no problem. I bought mine used on AudioGon and could'nt be happier. Hope this helps a little.
Enjoy
Enjoy