Theta or Bryston amps

I am hip deep in my new system and the time is rapidly approaching where I have to decide on amplification. Currently the contenders are Bryston and Theta. I intend to have a full 5.1 system so the Theta Dreadnaught 2 and a combination of Bryston 4Bsst and 6Bsst amps are being considered. My speakers are Thiel CS2.4's for mains and Thiels for center and surround. Pre/pro will be a Bryston Sp1.7.

I will absolutely be purchasing new from my dealer so the 20 vs 5 year warranty isn't of primary concern. What I am interested in is any commentary from those who are familiar with the amps and possibly these amps with Thiel's. I have seen posts that indicated Bryston would be overly bright with Thiels and those who swear that they are a dead perfect combination. My dealer thinks that this could be the combination of the older ST series of amps and/or older Thiel's which were noticably brighter than the new generation.

Thanks