I recommend a pair of used Quicksilver V4 monoblock tube amps. Proac speakers pair well with tubes, and IMO especially Quicksilver.
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With the efficiency of the 140 mk2 you have the option of considering a class A intergrated, the Sugden A21 is a possibility. If you want or need more power consider a used Rowland Concentra 2. Of the amps you mentioned I would only consider the BAT but I would prefer the intergrated VK-300x due to the convenience of 1 box and 1 less pc/ic.
Jdstrawn-ARC is widely accepted as a good match with Proac. I demoed the VSi-60 and thought the sound was thin and overly bright and there have been reliability issues with the VSi-60. IMO not in the same class as the BAT-300x. I didn't mention Pass Labs because at $3500 you would be hard pressed to find a nice 30.5 or int-30a. If you decide on a BAT-300x make sure you get a late model version(check serial#)with the 6922 tube.
Thanks for all of the responses. I auditioned (in home) the VSi-60. To my ears it sounded great, but that could be due to the fact that it is such a jump up from the Anthem. I also auditioned the Krell (at the shop) and it didn't impress when put up against the VSi-60 (to be fair, the VSi-60 is much more expensive!).
I will be able to audition the Cayin stuff (but the dealer is waiting on a shipment). Anything else is going to be tough to get to hear.
I would really like to hear some BAT gear before I pull the trigger on anything!
Anyway, thanks again for the input. I'm really enjoying this process.