Please suggest integrated for large space

I have a 15 X 32 space divided by a half-wall that also adjoins an entryway with two-story ceiling. I'm happy with the sound of my Creek 5350 se, Opera Consonance Linear 120 and Silverline 17.5's but the sytem lacks power to attain desired volume levels with many cd's. I could buy another 5350 se and bi-amp but would appreciate some alternate suggestions. I can afford $ 1600. Roksan Kandy ? PS Audio C-100 ? Quinpo A-8000 ? Cambridge 840 azur? Others? Thanks!