DISCLAIMER: First time builder here & I've been gaming on a Surface Pro 3 for over 2 years (sad!) so I don't have great reference points of how things should be/perform and I'm easy to impress. I'm posting this as this community has been super helpful in helping me pick my components for this build so I want to give back. I also think lots of users are looking to build gaming PCs in this somewhat affordable range so hopefully this helps.
Overall, I'm really happy with the experience as a first time builder. With a bit of research and manual reading, I didn't run into any major challenges and my computer hasn't exploded so far. I must say things were way more user friendly than I expected (Bios are in colour now!?).
For parts, the build revolves around 2 recently released components: the Ryzen 5 1500X and the MSI Radeon 580X 4G. I liked the good reviews and the feeling of going with the latest products. Other components are pretty much fillers and I don't think they require many comments. I went for a SSD as I'd rather get a drive that's small but fast and even with games I find that 250Go is a lot when you don't do pictures/videos. Also might get more RAM later or replace with faster one.
Performance: The build performs well as far as I can tell, I've tried Far Cry Primal and Dota 2 so far, both run smoothly on high settings and it looks really beautiful on that 21.5" monitor. The noise was totally manageable for Far Cry Primal and not really noticeable for Dota.
Challenges: - The monitor didn't come with a DVI cable and the Radeon 580X doesn't come with a VGA output so that delayed my build (and it added some $$ as I wasn't willing to order hat DVI cable online and wait more). - The mother board only had 2 3-pin fan power supplies and I needed 3 (1 for the AMD CPU cooler + 2 for the cases' fans) so I had to get a cable to plug that extra fan directly into the power supply. - Plugging the cases front panel cables into the MB was a bit of a hustle. For some reason the wiring map details were not in the printed manual that was provided but I did find it on the MB's product page on Gigabyte's website very easily.
Price: It came to about CAD1350 before Windows (running the trial version for now) and including those extra parts I had to get. Got everything from Canada Computers website and their branch in Toronto and I'm happy with my experience there. Probably could have made it cheaper by going for the cheapest retailer for each part but not by much I think, especially since they had some rebates.
10/10, would build a computer again.