Well, for $500 for photoshop, it'll be hard but I'll give it a try. I'll be assuming you require everything inside the case, I'm not sure if you need an OS, monitor, speakers, keyboard, mouse...etc. For the 500 i'll just list parts that go inside the case. Im not sure what exactly you need so I tried to keep balance between speed, from the SSD, a gpu that isn't powerful but supports latest standards like opengl and DX11, a reasonable cpu/mobo w/ USB3/Sata3 support. You can get more powerful hardware probably and save money on the mobo but I think I got the cheapest usb3/sata3 mobo from an okay brand.