Thiel 3.6, what will drive them best?

Krell: If you can find a cx series amp 300cx that you can afford, or better still a 400cx, I guarantee this will be exactly what will make them sing. This way there will be no current dipping by the amp at the minimum impedance they demonstrate in a the low 2s.

Trying to drive the 3.6 on a budget less than $1000 simply doesn;t make sense becuase there is no amp in that range that will do these speakers justice. Not my preference but a simple fact of life.

These speakers need current which means power supply which means cost.

I had 7BSTs for a time with a pair of CS7s. This sounded good for a couple of years. The key is not to crank it to loudly, I did one day and blew out the high end driver in the coaxial high/high mid unit (which Thiel replaced free of charge). The Brystons just didn't have the current delivery capacity to avoid going squarewave at high levels.

As long as you don't have unrealistic loudness expectations, the Brystons will do just fine.