Thiel 3.6 to Eggleston Andras II

At nearly 5 X the original list price, I wouldn't think there would be much of a comparison.

How about bigger Thiels?

Dunlavy's?

Yes, the Dunlavy's are "OB", but the parts are readibly available. They are bigger, have sealed boxes, and are more sensitive/efficent. They do share many design attributes with the Thiels.

Those CS5i's are a great recommendation, and would be my first choice in your circumstances. I would think it safe to guess that you've tailored the rest of your system around the Thiel house sound. IMHO, changing speakers, more so than other components, can cause a domino effect of system changes. Be warned the CS5i's are especially demanding of amplification, especially in a room as large as yours. That room, while really conducive to Thiels, might be stretching the dynamic limitations of the 3.6's. That won't be the case with the CS5i's (perhaps Thiels all time best product) with the right amplification.

The sub idea, is a good one, but I'd suggest a pair of them.

That is funny Dave!