The best amp period for large maggies is SimAudio Moon W-5, another good amp is the Clayton 70 mono blocks or similiar high current amps. If you want to stay with an integrated, go with the Krell KAV300i or 500i. I have Maggie 3.3's and have had many amps on them. I bought a Krell 300i for another purpose, never thinking it would do a very good job on the Maggies, and hooked it up on a whim, unless your room is very large, it will do the job very well...large room go with the KAV-500i
