I'm running all Klipsch speakers too:

CP-1 (Pro Cornwall) Mains
Heresy HIP (Pro Heresy) Center
Heresy HIP Sides
KG-1.2 (soon due for upgrade) rears

Have been very very happy with the 990 in this system. The older Klipsch speakers can get harsh/bright with the wrong equipment driving them, something that worried me a bit, when purchasing the 990 without being able to listen to it first. The 30day no-questions-asked return policy put some of those worries to rest. Didn't take long at all to realize that the 990 was a keeper.