Definitely the Past, I'd go back to yesterday and win some bigass lottery. Or maybe further back than that but yah. With that sole purpose
Reputation: 490Go back to the day your mother gives birth to you, walk past your father in the hospital, shake his hand and congratulate him, and give him a lottery ticket as a birth gift. Then mail your father or mother hundreds of schematics and patents, and other useful crap that will hit it big, so they can use that money to make even more money.
Then go melt yourself in acid (or you could watch yourself growing up rich) and enjoy life as a rich bastard.