Dear Pardales,
To answer your specific question, "can the 6500 drive maggies"? The answer is a resounding "YES"! I have the MA6500 driving Magneplanar 1.6qr's, in an average size room with very high ceilings. This is absolutely the best sound I have ever owned, and I have had some pretty esoteric & exotic stuff.
Nothing, I repeat Nothing, can touch the McIntosh amplifiers for "overall quality". The sound is so rich, full, detailed, pleasing and musical, and the controls are so very useful. Buy a Mac, you will never go back! Worth every penny!
Also a nice match w/ my Maggies.