I have had two pair of 846B's and they are very nice. I believe you would not likely hear a huge diference between the A & B's, the higher price is usually due to the older components being more desireable.
I had a pair of the 890A's with a bad horn and they still sounded very nice, however it is not realistic to campare them to the Valencia's as there is no replacement for displacement.
I currently have 19's and they are even another step above the Valencia's.
Unfortunately I have no experience with the Santiago but If my memory is correct It is one of the non horn setups. If thts the one it would not be in the running here.
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