My recommendation is to hire accountants, have them do the financial planning, and take what is best in your situation based on their advice. Lawyers who can recommend accountants is also good..
I mean, I could work out a half-assed plan, but I'd need to know things like your age and health so I can make a best guess as to how long you'll live, what your goals are(do you want to make a big donation upon your death?), the lump sum payout, the amount and duration of any annuity, etc...
Chris - you might be surprised at just how fast they can spend the money. I'd count on no more than a year.