i agree mostly w/mezmo - especially to ask thiel. but thiel's recommendation of a 100 wpc min amp doesn't necessarily mean one that puts out 200 watts into 4 ohms, as not all amps are class-a, that essentially double their power as the ohms halve. i tink thiel means that *at least* 100wpc into 4 ohms is the way to go. but, i do agree that a hi-current class-a amp would be all the better for the thiels than a class ab design
all that said, time for another shameless plug. :>) i *know* the electrocompaniet aw100 that i have adwertised here on audiogon, will do fine w/the thiels - i've had it & its smaller brother, the aw75, driving my thiel 3.5's, which are *really power-hungry, & they do fine. the aw100, class-a, 100wpc, 190 into 4 ohms, stable down to 0.5 ohms, >80amps current, can really handle the thiels, even in a large room.
regards, doug