I agree wtih Trcnetmsncom, skip the Opus. Those downward firing woofers just muddy up the bass, IMHO. I was not impressed with the sound of them when I was doing my speaker search. Stick with the Eidolons.
(By the way, if you have the big bucks available, you might want to consider the Eidolon Diamonds. I hear that they are even better than the regular Eidolons. So much so, that while I have seen plenty of Eidolons on Audiogon, I have never, not once, seen a pair of the Diamond Eidolons on Audiogon. That, to me, says a lot!)