Silverline Preludes Upgrade

I have a pr of Preludes I've used for years in an 8x11 room, always more than pleased with them, right up with best money I ever spent in 40 yrs of Audiofooling.

Room now has to used for other purposes so just on a whim listened to them in 15x25 room, about fainted when I found they sounded better and more "musical" in that space than the maggies and NHT 2,5is that normally reside there.

What would be the next step up in Silverlines, that would shine even better in a room that size?
SR 17, Sonata ??
I listen to about 80%. classical, 20% jazz.