be careful to buy with your ears, I've always found MF flatters to deceive. The nuvista was beaten in most peoples opinion by a Ming-da valve amp when we had a bake-off at my house. It sounds great and does all the hi-fi things, but somehow it isn't cohesive to me. It spends too long sounding nice, and takes all the edges away. I haven't heard the top end Naim, but I have spent hours listening to the 5, and to a 62/140. The Ming-da wee's on their ones strawberries too. It's a tough decision, but try and get yourself to Icon audio, they're in Leicester, and listen to some of their gear, they sell their version of my amp, and some other gear. I'm sure you will prefer their view of music to either of the two options you're looking at. They look fantastic as well!!!