First of all, what do you intend to do with your rig? Production? Gaming?
If gaming, then the motherboard choice is solid, but the i7 5820K is an LGA2011 chip, Z97 boards are LGA1150. You'll have to pair the 5820K with a X99 motherboard or downgrade the processor to an i7 4790k, which is the best CPU for LGA1150 now.

But if you are doing production and could benefit from the extra cores from the 5820K then go for it, otherwise you won't need so much CPU power.

Do note that the 5820K REQUIRES DDR4 memory and the 4790K can only support DDR3 memory.

I would also suggest getting a more solid power supply if you're looking for future proofing. When upgrading one rig to another, most of the time you'll keep the PSU and casing.
I suggest getting the V-series from CoolerMaster, the AX,HX,RM series from Corsair or the X-series from Seasonic. It wouldn't hurt to get a higher wattage JUST IN CASE you wanna go for an SLI build in the future. Getting more wattage does not mean a higher electric bill if you choose an efficient one, it will only draw what is needed. Personally i find the 700W to 900W range the sweet spot.

If you have the extra cash, upgrading the SSD to 250GB would have you worrying a lot less about space, I suffered using 120GB as well last time. You can save a little money by buying the Kingston V300. SATA based SSDs perform almost the same, might as well get the cheapest.

Lastly, the GTX970 would do fine if you're only planning to game on 1080p or 1440p, but if you're doing any plans to upgrade to a higher resolution, I'll suggest getting something a little more hardcore, perhaps you can spend the money you saved on the processor here. At this point in time, the GTX970 still gives a really good performance for the price though, just upset about the VRAM issue, I'm also running GTX970's. :/

Good luck! And don't be afraid to PM me if you got specific questions to ask.