Cary, Cayin or Primaluna EL34 for Merlin VSM-MME

I'm looking for an amp or my Merlin VSM-MME speakers. I know it's been asked many times before, and I've read most of the threads out there. The consensus seems to be that an EL34 based tube integrated is the best choice. Unfortunately the Ars-Sonum is out of my price range. I’ve got three amps that seem very similar on my radar and I’m looking for any opinions, comparisons, or/and criticisms.

1) Cary SLI50
2) Primaluna Prologue One
3) Cayin A50T

All are around $1000 used and have enough power.