PS Audio Trio C-100 ICE-power integrated, will drive anything down to 1.5 ohms, very smooth, natural and gutsy. Has pre-outs for subs and a remote. There are good used ones on A-gon for your price. I have owned 3 PS Audio Icepower amps (and N2Xs), and I think they are superb together. The C-100 is a way better amp than you will find in any receiver that I'm aware of, but not as flexible (3 inputs). For a little more yoyu can get a used PS Audio GCC-100, with 6 inputs.