I used the Extremas with a pair of Linn Klimax 500 monoblocks (290 WPC).This combo was superb: amazing speed, dynamics and "slam". The midrange was very natural and fully textured and the refinement in the treble simply incredible. No harshess, brightness or edginess - just beautifully smooth, natural and involving presentation. The Linns are IMHO some of the best solid state amps avaiable. They can be had used for a little less than 10K although they don't show up here often.
Good luck!
Good luck!