If your budget is a $1000 I would suggest you might consider saving just a little longer while waiting for a promotion deal on the Bottlehead Mainline you would most probably only need another $99 to secure one of the top tier amps for the HD800.
Ah ha you dont have to wait long
Bottlehead have a 10% off Labor Day promotion
coupon code LABORDAY10 at checkout for a 10% discount on any Bottlehead order.
The coupon is good through Labor Day, Monday September 7th 2015. (everything except LEDs and repair service is eligible!)