Check Crown Xi series within your budget. They sound very clean even for home audio.
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Have you browsed the Amps for sale section? I am almost certain that you will suffer "Sticker Shock" with very few for less than $300 that aren't project pieces. If you can DIY you might be able to pick up a piece which may only need minor repairs ot there goes the budget. For $500 Wyred for sound makes a stereo amp that might be just what you wanted i.e. more impact and dynamics. With those qualities being outstanding you might find your seet midrange recessed. So there could be some trade offs.
A quick update for people searching on the topic:
I ended up ditching the emotiva. In the end, it was better than before, but still would not bring the magic out of the Soavos.
After much play, I got the system to sing by changing the source. It turns out that the Aune T1 + Amperex Orange Globe worked wonders. The amp remained the Integra 50.3.
It is really awesome now. :-)