Nuprime st10 or nuforce sta200, or parasound a23

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?

my cables have 1/4 inch spades and fit in fine, though I could see how larger spades might be a problem

About the mytek i also checked it, but I will be paying for futures that I will not use, it looks like a nice device though, but thanks for the advice