Best amp for KEF LS50

Looking for best possible amplifier for KEF LS50s. I have tried Parasound Halo A23,  Benchmark's new amp and ,currently the Audio Alchemy DPA-1. So far, Audio Alchemy sounds the best, Parasound next and Benchmark the least satisfying, But, I'm still wanting a better match. I'm looking under $3000, tubes or solid state, new or used, and hopefully not huge and weighing a ton. I would really appreciate recommendations.