Perhaps you can consider mINT,

https://wyred4sound.com/products/integrated-amps/mint

to me, they have really good bang of the buck, but most importantly, they sound really really good.

I particularly like the small footprint which I can hide it inside the cabinet.

B&W showroom in PJ.

They are having a christmas promotion, USD1099.

Both are good amps. It all depends on what do you want.
If you streamed digital music, looking for space saver, you go with the mINT.
If you have lot of analog source, your go for A19.

But the former give you 100w per channel, built-in dac, lot of balanced connectors, and much lower THD.
Most importantly, it is direct sale, no excessive mark-up. Of course, this tarnished by weak ringgit today.

What do you mean?

There's no issue with having extra watts for something that is not so demanding (i.e: bookshelf speakers, efficient speakers, etc). Just gives you more headroom to manage your speakers frequency response without clipping/distortion.

My current amp currently does 75W at 8ohms, and listening it as a near field listening from bookshelves (86db at 6 ohm impedance)

Edit: misread your question, the form factor does not exactly dictate how much power it can do. Some small ones can output of power provided the transformers can handle it.

They deliver 170w into 4 ohms. Size? They are class d with analogous power supply.

You have not seen my 130 watt per channel power amp, they are about the same size.

bro Problem is right

just for everyone's knowledge sharing

Watts does not represent how good the amp will push the speakers
neither does higher watts they sound better

it is merely an indicator of its power output....and alot of manufacturers tend to provide bad info

example of a good amp manufacturer...will provide a measure of the power from 20Hz to 20kHz......why???
that's because at different frequencies, the power output varies....
and the lowest and the highest frequency range requires the most power

good manufacturers provide the the average output from 20Hz to 20kHz....

example from Audio Research and Mcintosh:
200watts @ 8ohms minimum power 20Hz-20kHz this is a damn powerful amp for basic listening

the next factor is damping factor, which tells you how much the amp can grip the speakers....this is a subjective measurement but generally used by many

marantz is not warm (a.k.a. midbass centric), more to voice, realistic and tame down aggresive speakers.
depends la, if u match with laid back speakers, it may sound a bit closer to warm tone

nad new model need to ask owner to give listening experience. but i see nad dont have treble bass tone control and speaker A + B function

marantz sounds more forward compared to NAD....NAD is slightly more layback
but again...this depends what sort of speakers and cables you pair with.....plus the source

if you ask me....i'd say marantz KI signatures anytime......i personally have compared CD6000 vs CD6000 OSE vs CD6000 KI Edition

CD6000 KI Edition wins hands down......and that has been a player i used for a very long time until i had the moo for an Audio Research

I've not heard the latest marantz.....whether have they improved or retained the same....

but if you don't mind used market......Marantz KI Editions are worth while....even the amps with KI edition......

the tonality, musicality and sound is really balanced, organic and neutral

i had that paired with Sonus Fabers Concertino Home.....boy it was awesome

Marantz paired with Dynaudio speakers. Add in a subwoofer and you"ll have a great setup. I know cos I set up the Marantz PM6005, Marantz CD6005, Dynaudio DM2/7 Speakers and BMB Subwoofer in my study and it can challenge the setup in my sitting room which comprises a Krell S550i, Krell S350a, Krell Phantom III and Sonus Faber Guarneri. No joke.

Denton looks best pair with tube amp. but best sound with more wattage

I bought it new for MYR3,320

I bought it new for MYR3,320

bro Problem is right

just for everyone's knowledge sharing

Watts does not represent how good the amp will push the speakers
neither does higher watts they sound better

it is merely an indicator of its power output....and alot of manufacturers tend to provide bad info

example of a good amp manufacturer...will provide a measure of the power from 20Hz to 20kHz......why???
that's because at different frequencies, the power output varies....
and the lowest and the highest frequency range requires the most power

good manufacturers provide the the average output from 20Hz to 20kHz....

example from Audio Research and Mcintosh:
200watts @ 8ohms minimum power 20Hz-20kHz this is a damn powerful amp for basic listening

the next factor is damping factor, which tells you how much the amp can grip the speakers....this is a subjective measurement but generally used by many

I have only heard Denton pairing with PM6004 in KLIAV, still not enough juice for Denton 

Get the PM8005 instead. 70W into 8 ohms compared to 45W for the PM6005.
Or get the Marantz PM11S3 (100W) or better still get the PassLabs X350.5 or XS300 

Wouldn't have a clue cos I already have 2 amps and not looking at Marantz anymore.
Ask me how much my next target is (PassLabs XS150) and I can tell you