Someone should dig out that old HFW/TomTom piece comparing the Naits.
FWIW, I've owned a 3 and four 2s. The Nait 2 is vastly overpriced on the secondhand market. In a small room, with the right speakers, it's amazing. I sold my 252/Scap/135s to pay for a wedding (mine), and the 2 I bought, for £150, and which I had serviced, was outstanding as a replacement. Another, even in the same room with the same setup, was not so successful. At a later date, in a larger room, with Harbeth Compact 7s, a third was just rubbish. A fourth, which I bought for a friend in 1998, continues to sound superb with Rega Kytes.
At their best, they have a zest which is infectious, and which blinds you to their other shortcomings. At their worst, with complex material, pushed too hard, they just shriek.
The 3 is probably a much better second hand proposition. It's more accommodating, and more propulsive. But it is weirdly coloured, with a very nasal mid/top, and a punchy but slightly detached bass.
At that sort of price/expectation level (and I know this is a bit leftfield), I'd much prefer an NVA AP50.