Nothing wrong with those parts EskimoJoe, 1070 is a good card, and it's hard to find a "bad" MB/CPU combo with which to run it. I did exactly what you're up to back in 2012, right around Black Friday times, I spent a lot of time searching and sniping good deals. That was when the 680 was the fastest card available, and I picked up 2 for SLI, and built a 2011 3930k system, and saved about 700$ on the entire system, 2700$ retail for $1980 total, by getting black Friday and other super deals online. The C70 Corsair case for example which was retail $160CDN back then I got for $50 at 1201AM on black Friday, just an example of one of many deals I picked off.
So, roll with your plan, you'll be able to save a lot of $, and a 1070 system will run pretty much everything out there and for the forseeable future, and give you the capability to get into VR with a card/system able to push it decently, if you decide to go the VR route, which IMO in a couple years will be not really an option, but more of a necessity. We have a 1070 in one of our desktop gaming systems, and it easily is as fast as the previous Titan/980ti card it replaced in the system it is in (6700k with a medium o/c). The 1080s and Pascal Titan we have in other systems IS faster, but not decisively so, especially for non VR LCD gaming, and in AH3, IMO the 1070 is the best option right now for bang/$.