Making a $300 PC was really difficult, mostly because they have a Blu ray reader and a controller (I use a wireless keyboard in this case). There was almost no leeway to make anything cheaper. I used one of the cheapest CPUs I could find that would work with the cheapest motherboards, even that didn't really work. I used the cheapest ram and HDD, although it is the same amount of storage and same speed as a PS4. I was pretty much forced to use a 1050, and even that wasn't able to make it cheaper. Of course, i used the second cheapest PSU since the cheapest one wasn't even 80+ certified.
Honestly, unless someone can make this $100 cheaper, I would just go for a PS4 Slim or Xbox one S considering your paying +$80 for a PC that's quickly going to become outdated. Also, you may want someone to build it for you, and that costs money, so if you really don't want to worry about maintenance/upgrading than that's even more money out of your wallet. You win here console peasants!!!
Here, building a PC that was $500 was really easy (just goes to show that PC's are MEANT to be "expensive"). Put in the BEST budget CPU out there. I used the same motherboard, cuz why not. I used faster memory since I had more leeway (as with everything else). But, I didn't want to go all out, so I used the same HDD as the PS4/Xbone killer. Really glad I was able to put nearly a mid-range GPU for such a cheap build like this. Used a case with side panels, and it looks way better (maybe even better than a PS4 Pro and an XBone!!!). Used a similar power supply. Pretty much had to put in a blu-ray reader if I wanted to prove that this could kill a console. Also threw in a wireless adapter since I had enough $$$ to do so. I used the same keyboard and mouse since its the cheapest one.
After mail-in rebates (which was $80 btw) the total is $10 more than a Xbone X and PS4 Pro! You're also likely to get way more frames than these consoles anyway so yeah!!