...Well, I'm not going to bother listing all those different spaceships that I'd want since that would just take too much time. A space elevator would be nice as well.
Psi amp from X-com or that whatever-chamber from the remake.
NO lightsabers as I would accidentally cut my head off with it or something. "I know! I'll just take two of those and put a rope between them so that I can swing them like a nun-chuck. I can foresee no way for this to backfire!"
Or maybe something like that nanomachine thing that the BBEG in Metal Gear Revengeance had. That would be cool.