RandomGuy, looks like promising news on the GTX 1080 prices. There was a lot of concern that with Nvidia charging $100 over MSRP for the worst version of the card (the Founders Edition, aka reference model) the good versions of the card would have that price premium over MSRP too. That thankfully hasn't been the case so far. For Asus their Strix 1080 is $620 for the standard model and $640 for the version with a factory overclock. For EVGA their ACX 3.0 is $650, their FTW is $680, and their Classified looks to be $700 (the Classified cards are extremely high end and meant for serious overclocking with water cooling and even liquid nitrogen). These cards should be releasing in a week or two, so that's more good news. No worries about waiting a month after launch to see good aftermarket cards hit the market. These aftermarket cards are way better because:
1. They run cooler, so you won't have to worry about the card slowing itself down to keep from overheating like the Founders Edition cards need to do.
2. They often have much better power delivery, so you won't run into voltage limits as quickly when overclocking. With that said, EVGA ACX 3.0 looks like it has the same weak power delivery as the Founders Editions. The Asus Strix, EVGA FTW, and MSI TwinFrozr cards look to have much more robust power delivery.
3. They run a lot quieter while also cooling better. Blower style cards like the Founders Edition have only one fan that has to run at a very high RPM to suck air in through the bottom and eject it out the back of the case. But these aftermarket cards blow hot air off the gpu and into your case. It sounds bad, and it is if you have a small case with bad airflow. Your case, the Phanteks Enthoo Pro, is huge and has great airflow, so that heat expelled from your gpu an into the case will be carried away and outside the case pretty efficiently by the channel of air you case has from the big 200 mm front intake fan and the 140 mm back exhaust fan already in it. So these axial fan aftermarket cards are far better for your setup.
4. The aftermarket cards are cheaper. Nvidia figured out people will pay a premium for that look in their Founders Edition cards even though the card performs worse. $700 for the worst version of a $600 card is ridiculous.
So similar should hold for the GTX 1070. You won't be stuck paying $450 for it, probably a lot closer to the $380 MSRP.