UPDATE: I have gotten some of the core components, and for now I'm using the stock cooler (I'm not planning to do any overclocking yet, so the stock cooler should be fine.)
I picked up a Ryzen 5 1400 and Gigabyte GA-AB350M-D3H mobo, and I'm probably just going to use a 450W EVGA PSU, since they seem to be cheap around where I live. 450W should be more than enough to handle it, given that the graphics card is just an RX 460. It also turns out that cable management is surprisingly easy in the case, once I got some adhesive zip-tie mounting squares (or whatever they're called). It's interesting to be able to use the side panel for cable management, since it doesn't actually come off. I also still haven't gotten Dremel cutoff wheels, so my first bit of modding was done with vise-grips and a hammer
. Had to remove the old I/O shield from the motherboard tray, since it was all one unit, and also had to remove some metal from the power supply area since the IEC connector was in a different location. It actually might be fine to mount a fan on the bottom, as long as it's fairly slim. The original motherboard was sort of mATX, but had 5 expansion slots, so the space where the bottom slot was can be used for a fan, and should be okay. I might need to add some feet on the bottom of the case, as the bottom is basically flush to the ground. I'm kinda out of money for PC building for the month (working during school while also having to pay for insurance is a pain), so hopefully the price of DDR4 doesn't go up.