Pass Labs XA30.8

The XA30.8 will totally have enough power to perform to your stated goals and then some. I used an XA30.5 on my Dynaudio Contour 60’s and was absolutely floored by how awesome it sounded; Drove them to perceived distortion free levels beyond which I normally listen, The XA30.8 has almost 6dB of headroom and is more like a 100 wpc into 8 / 200 wpc into 4 ohm. Pass rates the amps very conservatively; The first 30 wpc are in class A, the rest of the delivery in super clean AB mode.
( which is ~10 dB avg louder than your specs)...I was not expecting this result. Room is larger and wall to wall carpet and such.
As for comparison to Bryston: should be a noticeable improvement in resolution, front to back depth ("holographic"), much more refined treble, richer harmonic content across the board. More transparent and "live" feel; For a time I had a 4B3 with Dyn Contour S5.4 (Pass XP10 pre);
Go for it!

I'm not sure how much help this will be but I drove my Vandersteen 3A Sigs (87 dBL) in a room about your size with my Aleph 3 and found it did not have enough power for me.  The 30.8 may be different but the Aleph 3 is also a 30W amp and the speakers are close in sensitivity.

When I used this combo in a smaller room it worked well. Once I moved to the larger room it didn't.

Thanks Dpac996. Your response is certainly is encouraging and i am almost ready to pull the trigger. 

Panerai,

We have to note  a point with Dupac's comments, the Bryston 4B3 does he mean the SST3 series,  is a very different amplifier than the newer cubed series. 

Personally after being a Bryston dealer for a few years we found the Bryston amplifiers when paired with a tube preamp was the magic ticket.

Personaly we would agree that the Pass should be an even better sounding amplifier than the Byston which still sound a bit cooler to our ears than some of the other really great solid state amplifiers.

We would also strongly recommend that you also consider a Coda .8 which is a steal for the money, power rating is 150 watts with the first 18 being Pure Class A. The Coda was compared to a set of the way more expensive Pass X60.8 and found to compete very favorably with them.

Coda is from Doug Dale who was the senior engineer of Threshold with Nelson Pass. Pass left to form Pass Labs, Dale left and founded Coda.

Coda is not as well known but has a cult following for their remakable sound quality and price which tends to be lower than Pass for a very comparable amplifier. 

The new .8 series uses a massive 4k transformer coupled with a brand new output device this amplifier is rather remarkable, fast, smooth, and powerful.

One of the world's best amplifiers and very affordable.

As per power 20 or 30 watts will be more than enough with even an inefficient loudspeaker, you are close to the speaker and don't play that loud 

Good luck on your search.

Dave and Troy
Audio Doctor NJ

Dear Auditory,
Yes I mean the Bryston 4B Cubed (4B3). Bryston stopped using the SST naming convention after SST2 (squared).
Btw, just a tip: perhaps you ought to check your frequent posts for grammatical completeness and accuracy. It may help in your advertising campaign.