Franche, for what its worth, I to have ML (Aeon i) running with the 990/7700 combo. Whichever amp you chose, keep in mind the inefficiency of the ML's. At 4ohms, they crave power and frankly sound terrible without enough of it.

Over the years, I've listened to most of ML lines through a plethora of amps & pre/pros, including Anthem; which for the price, I wasn't overly impressed. I've had my 990/7700 combo for roughly 6mos and its top notch stuff. The audio/video performance is superb.

It essentially boils down to two basic things; your ears and your budget. Good luck finding an amp &/or pre/pro to perform as well as the 990 - 7500/7700 at this price point.