dell optiplex 780 emulation upgrades... Help?

[paulbean150]

I bought a used Dell Optiplex 780 with 10 gigs of ram and a core 2 duo CPU that runs at 3.2 GHz and would like to upgrade it as an emulation PC for my living room, I already have launchbox installed as well as my favorite emulators and games from Nintendo Gamecube back, unfortunately this thing has no WiFi OR Bluetooth functionality at all, I'd like to use PS4 and xbox one controllers, my plan is also to run everything from IDEALLY PS3 and Xbox 360 back, but I can understand if those are too demanding for this setup, I have no graphics card, and only 2 USB 3.0 ports, I'm pretty sure this was already refurbished once, seeing it's specs and the difference in the age of the disk drive and other components. The entire PC only cost me 20$ USD, can someone please recommend supplies for upgrades that'd total 100$ at most with the PC price included