Hey David,
Nice gear!
How does your 800 sound through the 1960BV? Have you ever A/B'd it with a cab with V30's? I know the BV cabs have the Marshall V30's which I hear are slightly different.
I also have a 1960BV and am curious of how the two match up against each other...
Actually I have A/B my JCM 800 2210 in addition to a Diezel VH4 through a Marshall 1960AV, Mesa Over Size Bottom/Standard Size Botom and Orange V30 loaded cab. All of the cabs used different versions of Vintage 30's. To our ears the 2210 & VH4 sounded best through the Marshall 1960AV even though it is a top cab. My son bought it. We got it home and played it next to the 1960BV. The BV has better low end def. So far it is the cab for my amps. I liked the Mesa's too but they start to get into the low mid area than can be muddy when paired with some circuits.
Thanks for stepping up Paul you pretty much nailed my thoughts on the cabs.

David
Just my $.02