I would recommend spending a bit more and go for a 980ti, because it's not that much more (at least here) but alot more powerfull than a regular 980 and if you use 3 monitors you dont want to miss that extra power.
Also i would get another PSU. Corsairs RM series is not really a good one and for a build like that i wouldnt go for a bad PSU.
Here is the PSU Tier list:
http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
You can pick whatever tier 1 PSU you want or maybe tier 2 if you want to safe a bit money.
If you want to stick with Corsair i can recommend the AX860.
Also 850w is a bit much for a single GPU setup. If you plan on SLIing later than it's just fine.
Otherwise:
The CPU will last you for years without any problems and a nice cooler.
SSD is as good as it gets right now.
Seagate Barracudas are nice use them too never had a problem.
And the case is sexy.