I think with the price of legacy Sooloos kit you can't really go too far wrong with this idea, particularly as a second system. You really do need to drive a good bargain, though. Since the MS200 is very competitively priced as a zone I think the real benefit of the Source series is their ability to run as Core.

If you're just running it as core then there should not be any effect on audio quality, since all the Core is doing is telling the store what music to pipe to the chosen zone.

Have you read this thread?

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.