It's a nice build. What are you planning on playing? I have a i5 8400 and a 1070 so we're kinda similar in gaming performance and honestly, for very demanding games like PUBG you can get 90-100 in 1080p ith a mix of high-medium settings so i dont really see a point in 1440p unless you want to decrease settings to improve the framerate enough to make it worth it. On the other hand, if you play stuff like Overwatch, Rocket League or CSGO a 1070 can easily run those at 140 fps so I would see more sense in getting a 1440p monitor. Is there any reason you're going for the 1600 instead of the 2600? The 2600 has a bit better gaming performance. I would go for it and skip the RBP mat to keep it at the same prize but that's just my 2 cents.