I have a Babylock, but not the Symphony. I have the Babylock Quilters Choice Plus, which has been discontinued now. But honestly I love my machine. I am so happy with it. I did get a great deal on mine as it was the floor model, but it came with everything on it, even the large extension table. It is much heavier than my Kenmore was, in fact ALOT heavier. It runs so quietly and smoothly. Does not bulk at the thick amounts of fabric I push thru it. I did take a look at the Symphony online, and it looks very nice. Not sure if its $2100 nice though.
The one that looks most like mine is the Serenade, that one has PDQ little foot thingy, lol. Its like a built in walking foot..so to speak. Anyway I do not think you could go wrong with a Babylock. But each of us have our fav's .... so what is mine might not be anothers. Good luck on your search.