But the point is... in two years, another 970... another 390x... another 390... another 980ti... are all going to be hundred(s) of dollars cheaper than they are now... In two years, a 970/980ti will be among the price ranges of the 700-early900 (50&60) series. If he can't afford a 980ti now, there's no way he can afford Pascal once it's out, so that's out of the question, and the 900 series is not going to drop IMMEDIATELY upon release. I know it's his call, but he came to this thread for advice, and you're quite frankly giving him poor advice. He does not need the SLI right now. As you said, the one 970 WILL run most games maxed at 1080p. So WHY spend the extra $300 (depending on how much it is there, I assume high $300s) when he could wait for prices to drop for a year or two, maybe even three depending on what transpires in that time frame.
The other issue I see with running a 970/970SLI right now is the VRam. It's not a 4gb card. It's 3 1/2, and with my R7 370 maxing some of my games out at 1080p (unfortunately not quite at that 60 fps mark, about 5-10 fps off) I'm using 3.2-3.5gb VRam max. That SLI is going to bottle up not because of speed but because of VRam, which is why I pointed to Radeon. The speed of the cards will mean you don't have to upgrade for years, your VRam will mean you DO have to upgrade if you want to keep with the curve. Which, leads me to 390, 390x, or 980ti, the third of which, is out of price range.
Edit: Forgot reading this from earlier in the thread, but he also is getting a 6600k, not a 6700k, which has even fewer PCIE lanes. Which means, he will have even less option on his motherboard if he goes SLI right now. I.E., if ANYTHING else goes into a PCIE lane (even a 1x wifi adapter) He will be running 8x4, which makes absolutely NO sense.