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
Since I have the time, I ordered a pair of M700s (the fact they are made in the next town over is a positive!).  Should be here in a week or so.  The promotion ending today made that decision easier . . .

May also try a A21+ as several people have said they think they'd prefer it.  And if a Belles comes up I'd be inclined to buy it to try out. 

Other input welcomed!  I'd also be curious to try something like a Krell KST-100 - funny that a KSA-100 Mk2 is only $20 more on a well-known used dealer site!
What are you looking to improve upon, and what amp and system sound characteristics are most important to you?
OP,
I hope you get the Parasound too and after all are broken in you could post the shootout results Vs the PSA. That would rock!  I bet there are many readers who have considered these two brands and a good head to head would be most welcome if you are able to swing it
I owned the A21+. Loved it!  I “upgraded” to the JC5 and frankly can’t tell much difference in my setup. Can’t speak to the PS Audio, but I can’t imagine you would be dissatisfied with the Parasound.

Sidenote.  I had an A23 and wasn’t really happy with it. Many have mentioned it. It sounded very “thin” to me. 
I too was concerned about the A21+ and the heat but it never has gotten very hot, just warmish However I never drive it loud!