The 8600k will be even better if you DON'T OC, and a big part of why I recommended it. Keep in mind btw, you need to get a cooler for the 8600k. I'm sorry, I may sound biased, but I never recommend Ryzen CPUs for pure gaming rigs. Even their new 2600 series still has the same problem the previous models had. They do not maintain a tight FPS window, and they require high speed RAM. Plus you need to OC them to the max to even get close to an Intel in similar price range. They fluctuate wildly in FPS, often dipping quite low. The Ryzens are OK for multipurpose rigs solely because they have more cores and can multi task better, but you'll be compromising gaming performance.
NEVER cling to just PCPartPicker for pricing. Often times they will not show your best options. Subscribe to Newegg's email subscriber promos. I regularly see the 1070 Ti lately for $450. Their latest email promo link shows an EVGA 1070 Ti for $470, and it's generally shown lower than that when you get a promo email from them. Now granted that is not $455, but that's an EVGA that normally sells for $570.
https://promotions.newegg.com/neemail/latest/index-landing.aspx
That said, keep in mind there are lots of rumors floating around lately that Nvidia will be debuting their 1100 series in Sept. I know, just another rumor, but this time it's thought to be more likely because of invites Nvidia has made with big wigs recently, something they usually do before a big reveal. Even if the new models are too expensive, it could lower prices on the 1000 series even more.
On case, I prefer to prioritize airflow over silence. Reason being, the only time a gaming PC is really making a noticeable amount of noise is when you're playing a game, and usually the game sound drowns it out. The only exception is stealth games that are hardware intense. I play tons of AC Origins on my 8700k, EVGA 1080 SC rig though, and my case has 3 120mms front, 2 120mm back, 2 140mms top, and 1 120mm side, and no solid panels in front of the fans like on silent cases, and it's never too loud or distracting. My case is an Antec DF-85. I love it because it still beats every case on air cooling temps, doesn't compromise cooling for convenience. B y that I mean it uses straight side rail HDD mounts instead of sideways mounts that block a lot of airflow. It also has variable fan speed on every fan, and filters on all intake fans which are easy to remove by swinging out the front doors the 3 front fans are mounted in. Unfortunately the DF-85 or a modern version of it are not made anymore, they went to mid size cases with less fans and space.
Here's a good article on cases with great airflow. https://www.xtremegaminerd.com/best-airflow-pc-case/
As far as SSD size or style, my rule of thumb is to ether get one just for OS and programs, in which case 120-128 GB is plenty, with a 40 GB partition just for the OS, or up to 500-512 GB if you plan to install any games on it. With the file size of today's games, 250-256 GB drives are kind of pointless once you take up 100 GB or more in OS and programs. You'd only be able to install about a half a dozen modern games at most. As for style, I'm eventually going to get a 512 GB m.2 drive, because my MB supports it and they are screaming fast, and can be had for as low as $170 (Amazon's price on the Samsung 960 EVO 500 GB for their Prime sale). By screaming fast I mean over 3000 Mb/s read and 2000 Mb/s write, literally 4-6 times as fast as a typical SSD. This means it's a nice way to speed up your OS and any programs, including times of anything installed or uninstalled on it. Of course it also greatly speeds up boot and reboot time, and the game level loading time of any game installed on it. It will even increase texture streaming in some games, but there, I'm mostly talking badly coded games.