Simply put the Boulder amps are wonderful, I own the 1050's with the 1010 preamp. My setup include the Wilson Maxx 2's and MIT Oracle V1.1 speaker cables, TNT HRX turntable and the BAT VK10SE phono pre with a Reimyo cdp-777 as dig front end. If you want to get the most out of your X2's i highly recommend the Boulders. Read Jeff Fritz's review of the Boulder 1010 pre and 1060 stereo amp at www.ultraaudio.com he also owns the Wilson Alexandria's and says he has heard nothing better when it comes to driving them.
Good Luck with your choice!
Good Luck with your choice!