Avantgarde or Acapella? Do you like horn sound? To me at least they sound very different than good cone speakers(Aerial,Avalon,Audio Physic,ProAc,Sonus Faber,Wilson,Kharma etc.)...
ProAc Response D80 or bigger D100 will work with your Lamm as well as most Kharma models. Wilson Watt/Puppy 7 and Maxx2 should also work. As a matter of fact Jonathan Valin said in TAS issue 153 that he was most impressed with Lamm exhibit with Maxx2. So, different opinion than from M.Framer. Some of the members here own same Lamm amps as you and some of the speakers mentioned above. Maybe they could help?
ProAc Response D80 or bigger D100 will work with your Lamm as well as most Kharma models. Wilson Watt/Puppy 7 and Maxx2 should also work. As a matter of fact Jonathan Valin said in TAS issue 153 that he was most impressed with Lamm exhibit with Maxx2. So, different opinion than from M.Framer. Some of the members here own same Lamm amps as you and some of the speakers mentioned above. Maybe they could help?