Shouldn't be a secret, but the silverline sonota, EITHER version one or two can be readily had used w/ change back from your $4k. Yes the martin logans are terrific, if you like electrostats (yes, i do), if you don't mind plugging each one into the wall, if you don't have any pets. For a cone full range the sonota is the speaker to beat. While silverline specs have been generous about how low thier speakers go, and the sonota won't go below 25, in my room i get plenty of 30, and that's not sujective, i've measured! I consider that a true full range speaker. My only consideration would be don't try to squeeze them into too small a room, and they sound better on the quieter side through an average listening level than on the louder side. They will be happy w/ a very small amp, and can handle a very large one as well.