Completed this in September, but just remembered that I wanted to post it. I like Corsair and Asus products so I tried to stick with those branded components. The HDD, mouse, keyboard and headphones are recycled from my past PC. Nothing overly special, does what I want it to - play games without issues. I modded the 650D by removing all the drive bays, front fan grill, sleeved front panel connectors in black paracord, installed a red LED power light, painted screws, slot covers, and PS bracket red, and installed a filter on top since I have it setup as intake through the H100i. I sleeved most of the cables in red/black stripe paracord (also called fireman or licorice) to match the overall red/black theme. I know some parts are overkill, but the price was right at the time.
EDIT: Added more photos of in progress work - LED mod, paint booth and 4 mods in one. You can see the red LED (650D comes in white), the front grill removed, front panel sleeving (if you look hard enough) and a 5.25 to 3.5 bracket - best investment of $6. I was able to mount a HDD and SDD to the same bracket, but didn't like the cable options.