Speakers for VAC sigma 160i -- need inputs

I've used amps rated at 275-400 watts @ 4 ohms on my Avalon in the same room and really the only difference I've noticed, maybe is a tad less bass...

Number 1 and 2

Magico S1

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.

Well, if you still haven't pulled the trigger, and your room is on the smaller size, I'd suggest hearing the Nola Micro References with your VAC (or if your room is larger, the Metro Grand References). I'm driving mine with a Phi 200 (almost got the integrated, but decided on a Shindo preamp with a separate amp) and am very happy with the pairing. Makes superb music.