Nuprime st10 or nuforce sta200, or parasound a23


Hi, in thinking to upgrade my amp  a parasound zamp v3, it's powering a pair of paradigm signature s1v3, looking to improve depth, imaging and mid frequencies .
Despite of price differences, which one would you recommend?
Thanks four your advice
128x128alfau7
The st10 is really good and the new Mytek might be good also.
I can't really recommend a parasound,bright and lean in the mids.

Kenny.
That's a really good deal,I don't know anything about the sta200 though.

Kenny.
I have one. It's awesome. Based on the Job Goldmund 225. Great review in Absolute Sound. Which also compares it with the Nuprime. A23 was a good value 15 years ago. Not so much now 
Thank all of you for your replies! About the nuforce, does any of you have had a problem connecting spades on the left speaker post? It seems almost impossible because it's positioned  like in a hole.
Also the nuforce review compare very superficially but positively with the nuprime, can somebody confirm this similarities?