Hello
I have Cary sacd 306 professional sacd, slp05, Cary 805 AE set up as well. I can say Cary 805 AE is my dream amplifier as well.
I had same struggle with speaker. I had b&w N 802 speaker before this Cary 805AE. Finally I edns up with ProAc D 38 and I am very happy with it. It is relatively sensitive speaker with 4 ohms impedance.
One thing I have to say is that first 100 hours speaker sounds bright and flat. I almost returned it bit after those 100 hours this speaker will give you larger than life clean solid 3 dimensional presentation. Detail but liquid mid range which is result of SET and good speaker.
I have listened original Cary 805 and ProAc Response combination 15 years ago and I have had dream about this amp all the way until a few years ago when I finally bought this system.
I am very happy with this set up.
One last thing, when you put this ProAc D 38 on the floor, use provided spike and do not put anything under besides your floor carpet. In my experience that provide best base response (significant difference)
Happy listening
H.Jung