With $1000.00 to spend, you have a plethora of choices that would work well with Klipsch Heresys.
For $300.00 to $700.00(huge $$$ I know), you could get a hold of a legendary vintage 80's/90's Luxman R-117 receiver and never have to consider anything else. The combination is that good.
An NAD C375BEE/375DAC would also be a great amp to drive your Heresys.
I am driving my Heresy II's with an Integra DTM-40.4 network stereo receiver(80w/ch) and could not be more pleased. I had the Luxman R-117 before the Integra but had to sell it to liquidate for some emergency $$$. With the DTM-40.4 now doing HII duty, I don't feel like I am missing a beat.