Advice request for selected gaming pc components

For the G4560, a stock cooler is more than enough, but I understand to most people, including myself, it doesn't look very appealing in terms of aesthetics. I usually don't recommend getting an aftermarket cooler on a budget build since I usually keep performance as the 1st priority and its price ratio. If you want to get an aftermarket cooler, I would recommend the Hyper 212 Evo and the Cryorig H7. The 212 Evo is a solid contender as for a value orientated cooler, it looks decent, and performs the best in terms of price/performance. You wouldn't need to worry about your temps in most scenarios (if you don't/cant overclock), and its not uncommon to even find people using it to overclock they're i5 6600k/7700k. Now for the Cryorig H7, it offers a bit more cooler temps, is much easier to install, and just look better (but i''ll leave that for you to decide). It costs a bit more over the 212 Evo, but doesn't really offer better value than the 212 Evo. You can check out how these cards look in YouTube videos to better understand what to expect aesthetically.

PCPartPicker part list / Price breakdown by merchant

CPU Cooler: Cooler Master - Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($24.88 @ OutletPC)
Total: $24.88
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-15 08:44 EDT-0400

PCPartPicker part list / Price breakdown by merchant

CPU Cooler: CRYORIG - H7 49.0 CFM CPU Cooler ($34.89 @ OutletPC)
Total: $34.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-15 08:48 EDT-0400

Honestly the only difference between the two motherboards is that the MSI model has support for CrossFire. Crossfire basically allows you to run two compatible or identical graphics cards together to offer more performance. However, most games don't offer good enough support for crossfire to make it a value friendly option yet, it most cases, it would be better to just sell of your current card and but a newer more powerful one, rather than buying another of what you had before to work together. Other than that, there is no real difference. The only reason i chose the Gigabyte model over the MSI because its cheaper, and is well renowned board, and i tend to lean more on to Gigabyte compared to MSI, just because of better reviews, quality, and mostly past experiences.

For the RAM, id probably say the RAM you selected earlier was better. I like Kingston HyperX more, and it has a 15 CAS Latency rather than 16 on the Crucial kit. I chose it because i'd be pretty unlikely you will actually notice that difference at all, and i was trying to shave off whatever extra cost i could from the build, if you feel like going for it, by all means go for it. But if you could, i'd recommend you get the 16GB kit of GSkill ram i recommended. Although you really don't need anything more than 8GB ram for any game i know of, that extra 8 gigs is very useful for having things running in the background, whether it be chrome tabs or just more services running. And as time goes by, 16GB will soon become a standard for gaming, as the extra 8 gigs still improved fps marginally in today's games. The MSI and Gigabyte motherboard above both have 4 DIMM slots, so you could always buy the 2x4 now and get and another 2x4 in the future, but investing in faster speed (like the GSkill kit above) can improve fps even on a non overclock able board through XMP if you desire to do so, and if you even upgrade your PC in the future to maybe a high end overclocking build, you have the high end ram that you can use with it, without having to make do with the slower ram you bought before or just chucking the slower ram and buying a whole new kit.

For the graphics card, the MSI card you liked more is currently cheaper than the Gigabyte. It runs at the same speed out of the box and they both are great choices. Definitely go for the MSI if you like it more.

http://www.outletpc.com/ew3897-msi-rx-580-armor-4g-oc.html?utm_source=ew3897-msi-rx-580-armor-4g-oc&utm_medium=shopping%2Bengine&utm_campaign=pcpartpicker&utm_content=MSI%2B-%2BVideo%20Cards

As for the case, the S340 is a fan favorite of myself and many people, although it lacks a top dust filter (which i didn't know about, thanks for informing me) , it is the exhaust fan up there like you said, and although it isn't really needed much, a dust filter is nice to have. A PC case mostly boils down to aesthetic preference, definitely go for the Define C if you like it better. Although it is more expensive, it does seem like kind of an upgraded version of the S340.

If you prefer having a smaller tower, you may also want to look at the Micro ATX version of the Define C with window.

PCPartPicker part list / Price breakdown by merchant

Case: Fractal Design - Define Mini C with Window MicroATX Mid Tower Case ($79.99 @ SuperBiiz)
Total: $79.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-05-15 09:16 EDT-0400

As for the power supply, definitely only look at semi/full modular. Although your PC wont even take more than 400w in high load situations, its always nice to have some headroom for future expansion and overclocking.

If your looking for reliable high faulty future heard room, this would be the best option at a relatively affordable price.

https://www.newegg.com/Product/Product.aspx?Item=N82E16817151119&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

If you have any more questions don't hesitate to ask.