Monitor speakers - choices to narrowed down to...

They blew away my Concertos. Very natural and open sounding. They really get with the music in a very cool way. They also are built to the 9999s and look totally cool.

Don't forget JMlab speakers...

I ended up with the dirt cheap, mass-market Polk RT35i after extensive home listening of these much more expensive models: B&W CDM 1NT, Sonus Faber Concertino, and Triangle Zephyrs xs.

I was using the Polks as a temporary measure but decided to use them for good. The Polks had less detail but awesome soundstage and imaging. They turned out to be much more fun and musically involving. No fatigue at all. The Concertinos were as much fun, but are quite inefficient. Also, they may not go too well with Bryston amp.

Saved a bunch of money and no more overly analytical listening. I just sit down and enjoy total immersion in the music. They are widely available. Or, if you can risk $10 for shipping, get them at Crutchfield and try them for 30 days. They provide excellent serivce and free, no-hassle returns.

You may want to reconsider getting a sub, even my tiny Velodyne CHT-8 added a richness and fullness that really fills out the music.

No audiophile snob appeal, just pure music fun and savings.

Audio Refinement Complete integrated
Sony DVP-NS500V DVD/SACD/CD player
DH Labs interconnects
Analysis Plus speaker cables

I have a room similar in size to yours. I'm using ProAc Tablette 50 Signatures with a tube pre and SS amp like you, though mine are the Blue Circle BC21 and BC22. Those little ProAcs sound very big and very satisfying in my 12 x 13 room. Your 4B-ST is probably way more than you'll ever need, but the musical nature of the big Bryston I feel will compliment most any speaker you end up choosing.

Although you say you can do without low bass, I've found I have to run my Tab 50s with a sub for best results. I think the monitors disappear better in my room when using a sub, and the extra low extension adds impact and realism. Maybe a slightly bigger monitor like the ProAc Response 2 would give you adequate bass without needing a sub. There have been some popping up used on Audiogon recently.

Godd luck.

Wonderful, simply marvelous. Oh yeh, they can rock when you want. The kind of sound you can listen to all day. One of the nicest, most detailed and layered images you'll find. Highly recommended!