TL;DR: Great first gaming build on a tight budget with very few issues and an awesome looking case.
I had been starting to get into gaming and my MacBook Air just wasn't cutting it anymore. It started as a ITX build, but quickly just became a full size build (hence the 2.5" hard drive).
CPU: I chose the 6500 because I wanted to be able to play processor intensive games, but couldn't afford the K version, this is just a notch below this. More so, couldn't get the heatsink and the processor.
Motherboard: I was going to get the Gaming 5, but the Gaming 7 just happened to have an open box, for the price of the Gaming 5. I really like it because of the white, which I plan to keep part of the theme. The utilities that you (in my case download) get from Gigabyte can be weird. Some don't like to work, others work right away. Most of the time it is just more straightforward to boot into the BIOS and change your settings there (plus you know if you make its though POST faster).
RAM: Looks nice, functions well, not overkill for what I like to do.
Graphics: I literally had no idea how to pick one, so it might be much, but it should handle most of what I have to throw at it for the foreseeable future. One thing I didn't realize is the fan only turns on when the temperature reaches 60 degC, I thought it just didn't work.
Case: TL;DR I wanted a window, and it had to make me fall in love with it at first sight, and this one did. I don't mind the lack of a CD drive, I use a MBA daily, and it has plenty of space in there. The back panel can be difficult to put back on if you don't do cable management just right, but I think I figured out the trick, don't put large cables under the motherboard area, keep them to the side. The journey first started with the Silverstone Raven RVZ02, then I found, somehow, the NZXT Manta, and really liked it, but I didn't know about the price, and then I thought, at this point its already a desktop build, lets just go full on ATX, so I looked at NZXT's cases and ended up deciding on the H440 (I also liked the S340, but I didn't like the back and was worried about the lack of a grill near the PCIe covers.
Power: My budget was $775 and I was cutting it close, so I picked the cheapest one that was from a brand I knew. However, after a few months, no explosions, fires, or any other oddities. With the case the non-modular nature isn't a problem, but if I had a case without the Power Supply cover, cable management would have been awful.
Mouse, Keyboard, Gaming Headset: Made by Sportsbot and functions. Goal was inexpensive and gaming headset was not required. Color is blue, but that doesn't matter right now, I didn't think about the keyboard and mouse until I was ready to power it up the first time. Had a bluetooth mouse, but didn't think about the lack of drivers.
For a first build, everything was easy to put together, however the lack of space made it kind of difficult to close up the case. When I had everything put together, I pressed the power button excited to see the Gigabyte logo, but nope, I forgot to plug in the power button + LED lights. Also to anybody who is doing a first build, I suggest pre-downloading your driver for networking onto the install drive, so on first boot you can install it right away, then install the rest.
All and all it runs really nice. At the beginning there was some lag/stuttering when doing processor and GPU intensive tasks like opening the start menu, or closing the start menu. Those seem to have gone away, probably due to drivers actually being installed (weird part was games ran fine). Plenty of planned upgrades for the future like SSD, aftermarket CPU heatsink, unlocked processor in a year or two after I think Cannonlake, another set of RAM, and a wireless network card, and more white things.