Parasound A21+ or PS Audio S700 monos?


Since I have some time on my hands, I've been playing with my hifi.  And it's time for a new power amp.
Rest of system is an Exposure 3010S2 CD player feeding a Naim nDAC, an Exposure 3010S2 or Conrad-Johnson PF2L, speakers are Monitor Audio Gold GX300s. 

In looking and reading, it seems like the Parasound A21+ and PS Audio S700 are the leading contenders.  New S700 monos are $1798; a 1 year old A21+ is $2000.  

Thoughts on them?
naimfan
@feldmen4 - Thanks!  That's very helpful, as your speakers are pretty close to mine (or at least should be!). 

As mentioned above, I may just buy a used A21+ to compare to the M700s (incidentally, apologies to all for getting the thread title wrong).  And will entertain other amps as possible . . .
Another option is the Van Alstine Vision SET 400. I have had one for three months and really enjoy it. It alternates in my system with a PS Audio BHK 250.

https://avahifi.com/collections/power-amplifiers/products/vision-set-400-amplifier

Frank also has a 30 day return policy.
Attention All Readers:

Right now any deal that ends today
will be replaced by a better deal tomorrow.
Even if you were born yesterday.
Now is a good time to sell 
but not to buy. Unless you enjoy
overpaying.
Naimfan-Keep shopping.

@erik_squires
My anti-fans will remember I made a mistake, while my fans will remember I corrected it.
Erik, have any of your "fans" asked for autograph? LOL

@tweak1 There might have been an issue with your A23, my A21+ runs warm but never hot and my speakers are not that efficient. I have 5 amplifiers and I hear a difference in the sound produced by each of them.