Amp's suggestions for B&W Nautilus Prestige?

...I need advice on amps to drive these speakers (snail), budget is $20,000.
They are 4 ways with active crossover, I need 8 channels 100W- 300W.
Amps will stand on a rack- maximum height is 20".
I am using an Audio Research reference 3 and Wadia 581i se.
I prefer to have gain to every channel but it isn't a must.
I thought about 2 x Linn Akurate 4200 (4x111W each).
http://www.linn.co.uk/akurate_4200

Thank you in advance for your time.