Your speaker choice would weigh heavily on which path to take. I owned the .5B/3B combo back in 1989 and it worked very well together (you're right, no remote with the .5B) but the B60 preamp section is the same as the current BP-20 which is a damn site better than the .5B. I owned a BP-25/4B-ST combo as well so I speak from experience. The age of the amp dictates a lot - there have been a number of variations or versions since the Bryston amps of 20 years ago and while they have always been a great buy you may be getting into quite aged technology at that vintage.
If it were me I would probably go for the B-60R - super integrated that could be used later on as a preamp if you were to require a more powerful amp down the line. You could even use in a bi-amp mode - the B60 powering the highs and say a more recent 3B powering the bass.
If it were me I would probably go for the B-60R - super integrated that could be used later on as a preamp if you were to require a more powerful amp down the line. You could even use in a bi-amp mode - the B60 powering the highs and say a more recent 3B powering the bass.