Well, if we're going to talk about what needs to be grafted onto our boxes once the money's there...
My next immediate purchase will be a Corsair M95 mouse. I have a Logitech G400s, and it's well and good, but it's not the wired MX1000 I was really hoping for, and the sheer number of thumb buttons on my ex's M90 kinda made me want to drool all over her laptop.
I haven't chosen my graphics card yet, but it'll almost certainly be an Nvidia card, since I want to play with neural networks on CUDA.
I need at least 1 new monitor.
I wouldn't mind upping my RAM to 16GB, but I'll probably have to start using MATLAB64 or Python64 before that's worth my while.