As most others on an advertising forum, I know advertising, not investing. Your best bet is to speak with an investment adviser, or otherwise someone who you can trust that is an expert on investments. It also depends on your age. If you're reasonably young, you might consider going with some higher risk/higher yield type strategies. If you are closing in on retirement age, you should consult with an investment adviser regarding some fixed income or more long-term conservative growth. You should be able to squeeze out a conservative 4-5%.
If you are reasonably confident in your ability to generate long term revenue, then go to ASW and ball out; e.g. coke, and multiple chicks at once. The standard used to be two chicks at once per million dollars net worth, but due to the recession, you can probably at least double that. Just ensure you have enough coke and/or Viagra as to handle the increased activity.