My vote is as follows.
I have 904's in a KPT435 format using crossovers from the KPT4350MS. I have a KPT684 running a crown xti1000 and am super happy with it. You will be just as happy with the 884 as I am with my 684. The best thing I(my opinion only, meaning no disrespect to anyone else) did was move away from subs with an integrated amp. My vote is on the 884 with the crown.
Edit: One more thing, the 884 will match perfectly with the 904's, and its in the same family of products