IT's all been said about older speakers adn newer ones. Even a new pair of the 2's is incredible. The trickle down from the 7's is in them adn personally, I'd probably get those over the used 3's. That's just me. I also feel that you don't need to spend much money to get a great pair of Audioquest speaker cable from the dealer you would get the 2's from and save money.
Just another way to look at things.