I'm very familiar with Tannpy Kensington SE; they are fabulous speakers that
will respond well to a tube amp of that quality. Also look at the newer Definition
10A (Alnico) in that range -- I've not heard it, but it's a very similar driver with a
more contemporary cabinet & look.
The VAC 160i is a fabulous amp that I've heard (though factory upgraded) with
the Magico S1, but not (yet) the Kensington. The VAC + S1 is a simply beautiful
combo -- I heard it with a Clearaudio Innovation Compact and Ortofon Cadenza
Red. I'd imagine the Kensington SE or GR would be excellent as well; the 10A
may also be an interesting choice.
I'd be very confident in either a Tannoy or S1 pairing with your VAC.