I just bought a GTX 980 because it supports HDMI 2.0, I am now running my HTPC at 4096x2160 @ 60hz over HDMI. As of right now the only graphics cards you can buy that support HDMI 2.0 are the GTX 970 & 980.
Just build myself a rig for the first time in a decade, with a pair of 980s SLI'd... it kicks like a mule... although unfortunately my AV receiver seems to support "HDMI 2.0 standard", rather than HDMI 2.0, which is a kick in the nuts.
Now I just need to wait for the consumer version of the rift.
Yeah, that's what I plan on doing this weekend. Wasn't planning to upgrade my GTX680 for a while as it was plenty for GPU acceleration in Adobe apps and for gaming at 2560x1440 but the Rift pushes it to its limit in several applications. Thought about just getting another 680 to put in SLI but my stupid past self didn't buy an SLI motherboard and it's not worth the hassle to buy another mobo, another 680, and rebuild the thing now that the 980's are out.