$5k AUS -
http://www.pccasegear.com/index.php?main_page=shopping_cart&sort=20a
Intel i7-5930k
Corsair Dominator Platinum 4x4GB 2666C15
Asus X99 Deluxe
Asus GTX980 Strix x2
Samsung 850 Pro 512GB
Corsair Graphite 780T White
EVGA SuperNOVA 1000W P2
Corsair H110i GT
Noctua NF-P14S Redux 1200RPM x5
There's a little fiddle room, switching out the memory for a cheaper option (Vengeance or HyperX) you could get some more goodies like SSD's. Cooling wise I just put Redux's because they are pretty and I guess Corsair fans and a Fractal S36 would work out at a similar cost, it depends on the urgency and your taste there. I wouldn't recommend push/pull or mixing fans. I still think 980's are well possible if your going as far as $5k, it's not like I skimped on anything else it's all excessively high quality which is what you want for longevity.
I was gonna do a $4k AUS build but it genuinely pains me to recommend getting a 970, infact I can't. I'm pretty sure you can swap 980 to 970 of your own accord.
JR