Had the same problem with the 2.5i (jealous of that mahogony finish you had Polarin!) The Classic 4's (and 3's I have in my bedroom), are the first NHT speakers I'd recommend to anyone, not just people who like NHT.
People would hear my 2.5i's, and think about buying them, and I'd warn them off. They really needed the right amp, ancillaries, and room to work. The Classic 4's need power, but they're not as fussy. Heard them sing with an Arcam a38, and with my McCormack DNA1, even with a Pioneer sc61 I use when it's just too hot, and I don't feel like running my McCormack space heater. Couldn't run 2.5's off a receiver like that. (well, you could, but they'd sound like hell)
They're great speakers. My only audio friend has Thiel 2.4's, and while we're both too prideful to ever admit that "your speakers are better", we both get tremendous enjoyment out of taking over one another's systems when one visits the other.