The Linn is a good shout. Obviously a 2nd Bryston or Belcanto 5 channel power amp would be good too.
Others to consider - Rotel RMB1095 (hugely powerfull 5x200 watts), Parasound HCA2205 (even more powerfull - 5x220). Both should be available ex-dem for £1800 or less.
There's also a Tag 5x100 power amp on ebay at the moment - it had some criticism at the £2.5K or so it was selling for new but the one on ebay was well under £1K when I was it yesterday.
There are various others - Primare, Copland, Myryad, Roksan etc that might be worth checking out.
I'd tend to go for a multi channel power amp rather than 3 stereo ones just for the neatness really - but that's just me.
Matt.