This is my first time building a PC.
I have been playing FSX on my 2009 iMac 27" since, well 2009. While the game runs alright, I have been waiting for an opportunity to get myself a proper gaming machine built specifically for FSX.
I wanted a solid system for FSX (Microsoft Flight Simulator X) that relies heavily on the CPU clock speed, and not so much on the GPU. So the processor choice was not very difficult -- Intel I7-6700K 4.0Ghz. When I researched the GPUs on the market, I chose to go with Asus Geforce 980 Ti OC, as it seemed to perform the best among competition. Another key aspect that helps with FSX performance is the low latency in DRAM. I went with G.skill Ripjaws DDR4-3200 16GB (2x8GB) CL14, which is blazing fast.
For storage, I wanted to have fast SSD for best performance. My choice of storage drives was Samsung 950 PRO 256GB M.2-2280 for Windows 10 boot drive, Samsung 850 EVO-Series 500GB 2.5" SSD for the FSX and add-on install, and Western Digital BLACK SERIES 1TB 3.5" 7200RPM for scenery, backups, etc.
For CPU cooling, I chose NZXT Kraken X61, which is keeping the CPU temps below 35C. Another very cool NZXT product I got for this build is the Hue+ lighting system. It completely changes the look of your PC with plenty of really cool lighting presets.
I am using the iMac as a monitor.
Finally, I chose Phantek's Evolv ATX mid-tower based on absolutely amazing reviews about the quality and looks.