Newton,
You owe it to yourself to include the FPB200 or 300 on your shortlist. Don't listen to the Krell Bashing Brigade. Listen to those Krell models instead, compare them to the other products that were mentioned as supposedly superior alternatives and THEN decide for yourself. I honestly doubt if any of the above have actually heard a Maggie/Krell combo like the one you proposed.
The partnership of the 3.6 with an FPB will not sound bright at all, provided you use excellent upstream components and choose your cables carefully. Capaudio was correct when he stated that the Krell will provide the current that the Maggies need in order to give proper bass performance, while its extended top end that will bring out the best of the ribbon tweeter. But a mediocre source component has nowhere to hide in this system and then sure enough the result will sound bright and awful.
Just wait until Jonathan Valin reviews the new Maggie 20.1 for TAS (which I'm sure he will do one day, being the Maggie lover that he is). My bet is that he will absolutely freak out when he hears them with the FPB650m, his current reference solid state amplifier. As a slightly scaled down version of that system I'm sure the 3.6 will sound terrific with either the FPB200 or 300.
This opinion is not based on hear say, shows or dealer demos, but on longtime personal experience with a comparible set up of Maggie 3.3's (with rebuilt crossovers) and the FPB200, using Transparent Super speaker wire.
cheers,
hans