It sounds to me as if you are describing the exact sound characteristics of PSB Stratus Gold i's. Not saying they are inferior speakers by any stretch but that is just the way they sound. I would try and demo as many amps as possible with your speakers. And as far as your aragon amp is concerned i have found that a tubed preamp is a far better match than an ss pre.
Just my 2 cents.
Just my 2 cents.