New/Used Amp recommendations for about $3k-$4k?

What about the Parasound Halo A21+?

What about the Bryston 4B3?

Yes after having the XPR-1’s in my system and going back to my UPA-1’s I want something else. 
I am using a Marantz 8805 preamp. 
I’m not interested in tube amps. 

What I was digging about the 100f’s were the mid range/tweeter.

I'm very curious about those GAN amps mentioned above. 

I don’t think the monster preamp as mention above is a bottleneck because I’ve heard these speakers on the same preamp with the XPR-1 mono blocks and they sounded so sweet and detailed. 
I’m looking for an amp with as much detail as the XPR-1’s but don’t have the big form factor. I had to keep the XPR’s out on the floor on granite because they were monster sized amps and weight over 100lbs. 

My 8805 has a very nice 2 channel setup feature that allows for some nice 2 channel stereo listening. It’s not just a movie preamp. 
I have the same four sub woofers in each corner of my room for lost of bass. 

Alright people,  

I ended up getting the Parasound Halo A21+ in black.