I just looked at the website for your speaker and it is specified as 88db and an 8 ohm load which the manufacturer states to be an "easy load that will work well with a variety of tubed and solid state amps". Your quest for a high current amp is not really necessary.
What did you not like when powered by the Nuprime? I would suggest trying several amps in your price range, tube and solid state to find what you like.