Better Amp for Cornwall IV's...

@OP,  

I have the Cornwall IVs.  I agree with so much above.  They are very versatile--you could swap amps to your hearts content to change the sound.  

How big is your room?  How loud do you like to listen? 

I do think you should try tubes or Class A.  

I have a 300B SET that sounds great but it's not enough power. I know folks will say that's sacrilegious, but it's true for me and I don't listen that loud.  I do like it, but I prefer my Primaluna integrated (modified).   

The thing with the Cornwalls is they are so efficient you are really going to hear all of the amps positives and shortcomings. 

I hate to spend your money... but if I could...are you open to trying different stuff?  I think you might want to.  Some solid state offerings can sound dry, brittle, harsh (you name it) with these speakers. 

Quicksilver Mono120 the perfect amp Klipsch

Enjoy the Music 
Tom

why not try a rega brio? i was impressed with the mellow overall sound of this amp. it is good for about 70 wpc peak power, from what i've read, more than enough for your cornwalls. when you turn up the volume on this baby, you just get more volume, and not more distortion, one of the few in its price range you can say that about. 

Pass Labs XA25 class A would be more than enough, to make the
Klipsch Cornwall’s sing.

+1 for tubes 

I just acquired a set of Cornwall Is and put them on a 10W home built tube amp.   Plenty of sound, plenty of power, plenty of detail.