Being a Quicksilver fan boy I highly recommend that brand. My friend is using the Mono 120 amps with his Proacs and loves them. I use the Silver 70s ( 70 watt ) with my low sensitivity ( 83db ) Harbeths with no problem. You should take a look at the Sixty Watt Mono amps as they would drive those speakers just fine and at 3 grand you will be getting a bargain!
http://quicksilveraudio.com/amplifiers/
http://quicksilveraudio.com/amplifiers/