The Lazer3D LZ7 is an excellent case that is fully customizable in colors and vent openings (for fan or dust filter mounting) resulting in different air flow and noise control. See Lazer3D Configurator for more details.
A Noctua NF-A12x15 fan is used to replace the fan on the Scythe Big Shuriken 2 Rev. B CPU cooler. The Noctua fan is much more silent then the Scythe Slipstream fan and performs similar. One disadvantage is that the Noctua fan doesn't fit using the standard mounting kit that comes with the Scythe cooler. I solved this by attaching the Noctua fan with zip ties. See Review LZ7 CPU coolers for details. Using the Big Shuriken idle temps in combination with the Intel Core I5-8400 are around 28 - 31 °C (@ room temperature - 23°C).
A MSI GeForce GTX 1070 Aero ITX OC 8GB GPU is used because of very good gaming and cooling performance with very low noise. At idle around 35°C and completely silent (passive cooling) since the fan only spins when the card reaches around 60°C. When stressed temps are just below 70 °C with ca 40db. See guru3d review - MSI GTX 1070 for details. PCPartPicker tells me the MSI GeForce GTX aero 1070 8 GB OC isn't compatible with the Lazer3D LZ7, which isn't true. It fits well in the case with no compatibility issues. See Assembling Lazer3D LZ7 for details.
Features I need (or don't need) on a motherboard are: -- M.2 Socket for NVMe SSD, preferable on the top side (a heath sink is a plus). When using a M.2 slot SSD, 2 cables can be left out that are otherwise needed for a SATA SSD , which is a big advantage in a mini ITX build. Also, there are a lot of motherboards with a M.2 slot on the backside where the heat from the NVMe SSD gets trapped between the backside of the motherboard and the case since there is very little ventilation in that place. -- A descent audio chip, if possible Realtek ALC1220. -- At least 3 x 3.1 USB ports. -- Since I'm not going to do overclock I don't need a motherboard with Z300 series chipset (but 300 series is needed for 8th generation CPU's).
I finally have chosen the Asus ROG Strix H370-I Gaming. I removed the plastic IO cover that is mounted above the IO panel and VRM heath sink, since i don't see the benefit of it except looks (and at first I thought there would be a compatibility issue with the Scythe Big Shuriken 2 Rev. B, but there is no problem combining these 2).
A Kingston A1000 960 GB NVMe is used as primary storage, this "budget" SSD has more then descent read/write speeds for it's price class (read 1500MB/s, write 800MB/s) with a TBW of 600TB. And important, Kingston gives five-year warranty on this product.
Some numbers - Cinebench (CPU Benchmark): CPU: 56 - 59°C (68,7W), MB: 28°C, GPU: 44°C - 3DMARK (GPU Benchmark): CPU: 56 - 61°C, MB: 30°C, GPU: 69°C - Wolfenstein II The New Colossus on Ultra (132 Fps, 8.32 ms): CPU: 49 - 56°C (41,7W), MB: 34°C, GPU: 71°C (154,4W). All at Ambient temperature ~ 23°C.