A great speaker that you can get used for around 2K is the Thiel 3.6 as many owners are upgrading to the 3.7 which sells for 13K. It demands high current amps as impedance dips down to 2.5 ohms. Your Hegel is rated at 120 watts into 8 ohms, 240 into 4 ohms so this should be fine. I also second the recommendation for the Thiel 2.4 and Magnepan 3.7 made by others above. In addition to A'gon try some Thiel dealers such as Audio Consultants in Chicago area for used gear.
