Don't think I'm crazy but...

If you like the Thiel sound, you will need one of the larger models to fill out such a large space. I would look at the CS6 or CS7.2. You could find the CS6 for under $5K used, but shipping will be a big pain and expensive. You will then need some serious amplification to drive these beasts. Mono blocks might be the best way to go (of course, with seperate dedicated (20amp minimum) circuits. It will require extremely gutsy amplification with the amp(s) capable of high current. I'm talking Krell, Levinson, Pass, or Rowland, to name a few. I auditioned the CS6s w/ Musical Fidelity's kW500 which sounded very nice except the dealer's room was too small for those speakers.

Good luck.

~~~~That is a big room. If you want more volume you have to move more air, be it more driver movement or larger drivers. Both have a trade off in accuracy. The Infinity RS1's in my set up allow a large volume of air to be exited with speed.

Just The Facts
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Higher efficiency will definately help your problem. I use JM Lab Electra 926s which use WAY less power than my previous Paradigm Reference 100.2s. My McIntosh meters never read more than 50W even when I have it really loud. At that same SPL, the Paradigms used 150W+. Look into Electra 936 or 946. They have clean clear sound like Thiels but more musical in general. Good luck!

Several problems here:

1) That's a big room and will be hard to pressurize.

2) Your speakers lack surface area ( drivers ), sensitivity and are of low impedance.

3) You bought a Bryston amp. If you want to know what i mean by this, look up some of my previous posts here and at AA about Bryston's inability to drive low impedance loads with authority. While I had stated this several years ago and others thought i was nuts / just bad-mouthing Bryston, Stereophile confirmed this with their review of their 500 wpc @ 8 ohm amp*.

4) You need more efficient speakers with more surface area and a more versatile amp. Sorry for the bad news. Sean
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* Could someone please make Stehno aware of this fact. Contrary to his ideas, the multitude of "generic statements" that i make aren't just "random thoughts tossed into the wind" or a "plot to undermine and destroy" certain companies and individuals. Most are well researched ideas based on personal experiences & logical deductions arrived at through careful technical analysis. As time has proven, many of my comments are quite often verified by outside sources at a later date, much like the situation here.

I used to be a volume nut too. And a smaller pair of Theils (I think they were 1.2's) that I owned left me unsatisfied. Now with larger speakers that can go deeper in the bass department I find myself not needing the volume as much. I'm sure the big Theils that Mstram mentioned could play loud with a large enough amp but the bass would still be on the weak side.