Let me add:
There are no absolutes with the Verite and in audio in general. Though OTL amps get tons of praise in this thread, and rightfully so, they are by no means the only option to audio bliss. I successfully run a SET transformer coupled amp, the ALO Studio Six with tremendous results.
I truly believe that your current amp, the Cayin HA-1A MK2 should be an great match for the Verite.
The truth is, after attened two CanJams now I can tell you that I've heard the Verite on at least 12 different tube amps. Some OTL, some transformer coupled. I really believe that at the end of the day what matters more than OTL vs transformer coupled, is your other gear in the chain. Source, cables, clean power, and on. All of these individual parts add to the total sum.
To sum up my thoughts, I'd say that your Cayin amp is more than capable of allowing the Verite to strut it's stuff.
One last thing, congratulations on your Verite order. If you enjoy then as much as I enjoy my two pair, then you'll be a very happy listener, indeed.