With a 4B-ST - Rogue 66 and 66 Magnum, very nice match-up, good value on the Rogue
With 4B-SST - Rogue 66 Magnum ok but when I went to the 99 Magnum thats a whole different experience. Superb value for Magnum 99 when bought used in the $1300 range.
With 14B-SST - Magnun 99 and then a Hovland HP-100, now we are talking a new path to enlightenment! The only preamp (in a price range that I can live within) that I would consider trying after inserting the Hovland is the new BP-26 with built in DAC and it would be more for the DAC then anything else.
Bryston amps obviously work extremely well with their own SS preamps but many people have had good success with tubes just ahead of their Bryston amps...
You might do a search over at AA or A-gon