Should I buy a Class A Amp.

Class A circuits eliminate crossover notch distortion, which is very low in modern amps anyway...you should listen to how an amp sound with the rest of your gear, and then determine its value for you. 

Don, I cannot say what amp you'd like best.  I don't believe anyone here can.  My opinion is that the word "best" should be stricken from our audio hobby vocabulary.

We simply have too many personal preferences about what pleases us most.  And our systems/rooms are too diverse and matching can be a key element.

So with that, let me offer a suggestion to look into, an amp that is not well known -- the Monarchy SE 100 Mk2.  They are compact, reasonably light (monoblocs), affordable, and apparently satisfy customers with a wide variety of speakers, from Quads to large dynamic systems.

Get a pair of Usher R1.5 power amps and a Shindo Partager/Auriges or Mystere or Audio Research Preamp. I can vouch you’ll never look back. Before gunning for big money power amps listen to this pairing. The whole point is get a good very good Poweramp and a even better PreAmp. With a good power amp at one end the pre amp becomes your modular switch , a valve pre amp for your mood to sooth and ss when you want to rock. So wise up.

The amp must be stable into the bizarre loads presented to it by the loudspeakers. Give yourself a chance to change speakers without creating an event with speaker matching.