Should be good enough imo if you wanna have a wind of change to ultrawide experience. 
You're right. But it's like them Asus MY buy those US retail units and sell em here. Price is ridiculous no matter how I try to justify it, but maybe that's just me. 

Welcome to the club! Don't forget to set refresh rate to 100Hz

yes bro. if not, it will simply lock to a normal 60Hz. 100Hz is enabled via the embedded Gsync module of the panel.

anyway, one upgrade at a time.    Pair the monitor with a compatible NV GPU and you can enjoy Gsync also. It isn't just about the 100Hz, for me the most important thing is it is Gsync-capable panel.

what's your full pc spec, if you don't mind me asking? Just buy one thing at a time. I'm in a midst of upgrading also, buy some hardwares at a time, on my own pace. 

Mine even pity spec i5 2500K and 8GB RAM 
Upgrade GPU and larger SSD    i5 3470 and 16GB RAM should still good enough for 1070

for a little bit of future-proofing, you won't get wrong in choosing either the H170 or even better the Z170. The later comes with additional support of 20 PCIe lanes by the Z170 chipset, exclusive of the 16 direct PCIe lanes provided by your i7 6700K (a total of 36 PCIe lanes), in which you can play around later on in expanding your system for your IO peripherals, for example, a NVME SSD, a PCIe-based storage, a faster wifi card, etc. This is important in case you want to do SLI in the future, who knows right?    Furthermore, you choose to go for the K version of the i7, so Z170 would be a better choice there.

and to answer your question, 650W is good enough for the above specs, but you never know if lets say in the near future, you wanna add on another one card and maybe do some OC on your CPU and GPU, if I were you, I'd go for the 850W, just for the future upgrade and better efficiency of the PSU operating at half the rated wattage, generally. I did this mistake by buying the 750W, coz I have the plan to do some SLI also later in the future. Wasting a lot of money by buying low wattage then gatal wanna do SLI and need to buy another one. Poor initial planning really. 

this setting not so good le... GTX950 a ibt jialat for 34"

razer put shadow curve monitor pic...then 20 aug will announce lo

https://www.facebook.com/razer/photos/a.777...?type=3&theater