If you will be playing at 1080p, you will already be achieving higher framerates than 60fps.
(ultra) in many situations so I'm basically telling that you can save money. The difference between GTX 970 and the 980 is about 20 fps.
Since the GTX 980 is 150 dollars+ more expensive you could either save money or put the money towards a 250GB SSD, if you haven't done that yet.
It's up to you though. Actually, you can also go for the i5-4690K and a Z97 motherboard in combo with the GTX 970.