Help choosing an power amplifier

I ALWAYS suggest a BAT VK-300SE or the update VK-3000SE. The 3000SE is preferable only because it's hard to tell how old a 300SE might be. You can call BAT and give them the serial number to get date-of-manufacture.
These integrateds are designed by a Master and just sound "right" musically. You can usually find one between 2000-3000 dollars.

As these drop below 4 Ohms I’d suggest something that is rated / measured between 60 and 240 Watts per channel into 4 Ohms, depending on your room and desired volume levels..  B & W’s typically work best with s.s. amps. That B & W purchased Classe’ suggests they are a good pairing.

Depends on the size of your room, how loud you listen and how much power you want/need.  Given that B&W is a challenging load with a forward sound profile, a warmer amp that handles lower impedances would be ideal.

For lower power I would look at Naim, for higher power I would look at AVM.  These two brands match well with B&W, Focal, Magico, etc... where you have challenging loads in terms of impedance and need a warmer sound profile.  

I am using a $1500 D-Sonic M3a 800s Class D amp to drive a very hard to drive Thiel CS3.7. It is not as crystal clear as my Benchmark AHB2 ($3000) but it is much better suited power wise for the hard to drive CS3.7. It is also a little warmer than the AHB2.

I was only planning to use this amp as a short term amp until I bought a more expensive amp ($6K - $16K range). However, I will keep my money in my pocket for a bit longer because this amp is growing on me.

So, it looks like you have an Emotiva TA 100 integrated right now. In your original post I also see something about the emotiva basx A300 stereo amplifier. I’m not sure if you are currently running the A300 with your integrated or if you are interested in adding an A300 or similar stereo amp but I might make another suggestion. How about a higher quality, more powerful integrated?

The Parasound hint 6 ($2995) is a well regarded option and Safe and Sound usually has open box units around $2549. At 240 watts x2 @ 4ohms it would see you through the next couple speaker upgrades.

If that’s too expensive the Outlaw Audio RR2160MKII for $999 is a really solid option with 165 watts at 4 ohms.

I am also a fan of the Yamaha integrated amplifiers and they have cost options at about any pricepoint. Hifiheaven is a Yamaha dealer and they have treated me pretty well regarding the trade in program if you have some gear you want to put towards the upgrade.

All these options have built in DACs as well so I don’t think you would be losing anything connectivity wise. On a side note I started with Emotiva gear as well and I have nothing against them. The low price points are great for getting people into the hobby. Good luck with the rig. Looks like a nice set up so far from your system page.