Speakers for Bryston

Legacy classic & focus models were a great blend with Bryston gear

I have the 4BSST and pair it with Focal/JMLabs Mico be's. I detect no cold, hard grainy issues at all. I have also run this amp with the Focal 927be which is a floorstander (limited production and precursor to the 1027/1028be current models). I have a small room and both setups worked very well. Some of these "be" Focals have become pretty good deals especially considering their original prices and the performance you get. FWIW my collection contains many of the same styles you list as program material.
Nice amp I love mine; you have many choices in compatible speakers and now you have another to consider.

In no particular order I would recommend B&W speakers from the 800 series and also the Dynaudio Contour and Confidence lines (though some find the Bryston-Dynaudio a bit on the cold side).

Dali Helicon and Euphonia lines might also be a good match. I have audition at home the BP25 pre and the 4BSST amp for a week. I used them to drive a pair of Dali Helicon speakers complemented with a REL Stentor 3. The combination was quite good.

Finally, the BP25-4BSST combo sounded terrific when driving the MBL 121 speakers.

I have the B100 sst and it's anything but cold and grainy,especially on a great sounding piece of vinyl,I think what it's fed it captures and reproduces very well.I really hear differences on Lp's with soundstage and 3d realism,much more so than on CD's.