I have had the Bryston B-135 for a couple of months now. May I say, good choice ! It replaced my B-100. I must ask how many hours you have on it to date? The reason being, I found the B-135 came to the fore after about 100 hours of break in at average to fairly loud listening levels (never powered down even to standby). It is now absolutely stunning! The biggest difference I noticed was in the bottom end, the least in the top end. It certainy is better than the B-100. An improvement greater than even I expected.
My first consideration would be the addition of the PSB Sub Series 500 Subwoofer. You would be VERY hard pressed to find a speaker under $6-7000.00 a pair that would match the mids and top end of your Synchrony II's, and be able to deliver the bottom end accurately. Never mind there near perfect imaging! A very good less expensive alternative would be the NHT B-12d subwoofer (exceptional value).
Ahh, audio advice... take it or leave it eh.
Cheers; dmacg