Assuming you already have a car, a decent place to live, a job, etc.
I'd buy a kick-ass home theater system - huge HD screen or maybe a high quality HD projector, 7.1 surround speaker system, receiver, amplifier, and all the rest of the shit you need.
http://www.audioholics.com/buying-guides/system-buying-guides/
They have recommended systems ranging up to $75,000 lol.
And of course I'd do something similar for my computer setup, or find a way to integrate them together.