Hi Ianchang,
a fellow Avantegard user here. I am very interested in your choice of amps. I am starting to look into amps to drive my AG Trios.
At the moment I am using some rather powerful Bel cantos which are a left over from my low sensitivity speaker days. They do sound great with the Trio strangely, but I am sure there are other amps worth trying out and possibly more suitable for 110db/watt.
Do you have any ideas? I was thinking solidstate, like a first watt or Red wine audio or something. I feel nervous going back to tube amps. I want to keep the ultra low noise, detail and dynamics I already have.