Honestly, I think you have a big dog that you can't afford to feed. Sure, you can keep the dog alive, but he'll never be all that he's capable of.
I think both the B&K M 200's and the Classe' amps will adequately keep you going. I ran the M200's on older easier to drive Thiels with no problem, but the 3.6's are a much tougher load. I had a friend run Dunblavy SCIV's which while still easier than the 3.6's are similar. It was amazing how much that system improved when he bi-amped with an additonal factory matched pair of M200's. Though he ran all 4 factory matched amps through the Dunlavy's pasive cross-overs, the sound opened up dramticaly when using 4 as oppossed to 2. Much more than I would have ever anticipated. Draw your own conclusions. If were in your shoes with Thiel 3.6's, I'd try to figure out a way to purchase the biggest Krell I could afford or find an easier load.
I think both the B&K M 200's and the Classe' amps will adequately keep you going. I ran the M200's on older easier to drive Thiels with no problem, but the 3.6's are a much tougher load. I had a friend run Dunblavy SCIV's which while still easier than the 3.6's are similar. It was amazing how much that system improved when he bi-amped with an additonal factory matched pair of M200's. Though he ran all 4 factory matched amps through the Dunlavy's pasive cross-overs, the sound opened up dramticaly when using 4 as oppossed to 2. Much more than I would have ever anticipated. Draw your own conclusions. If were in your shoes with Thiel 3.6's, I'd try to figure out a way to purchase the biggest Krell I could afford or find an easier load.