When I get my backtime I'm going to be buying equipment and furniture for a fully functional, multi-taskable computer repair shop. My aunt has a marble workbench for me and I'll buy a chair for it and work there, financing all manner of spare parts, peripherals, hot-plug bays, and a guinea pig build on a test bench chassis. :D
I'm also going to be doing some volunteer work, as I've broken a few systems too that my mother's not happy about. Might as well get my feet wet, eh? It's all beneficial.