I also owned a Nuprime STA-9...their class a/class d hybrid said to emulate the tube sound; $700, better low end...better detail...slightly more three dimensional but somewhat bright (in my system at least) in the upper midrange and top end....kept this amp for a couple months.
Now I own the Digital Amplifier Company 2Cherry...$2400 (for the past 6 months)...and for that increase in price, you would hope/expect that things would be a lot better...and they are, the best amp (including tube amps and class a/ab amps) that I have ever owned (so far?). Great detail, great clarity, great soundstage, life like realism (in my system with Salk loudspeakers with RAAL tweeters). No weaknesses...not a hint of brightness.
My advice...since amps DO sound different....and since class d amps are generally lighter in weight and less expensive to return....try 2 or 3 of them at the same time and send those back that don't give you the sound you are looking for....$50+- if return freight is nothing compared to getting to hear them in your home, on your system with your music.