Well first off I don't take a "retirement" seriously in boxing.
But assuming he is serious, I'd like to see him fight Mosley for his last fight.
I think Shane's speed would give him the most trouble of any fighter listed there.
And that's the meal ticket if you want any chance against him.
Although the Oscar fight will bring in that fat fat paycheck, Floyd beating Shane in his last fight would answer more questions to me personally.
And then he'll come out of "retirement" for that big comeback fight against Oscar! Pretty clever marketing to sell himself after a less than fan pleasing destruction of Baldomir!

As for Hatton? Out of the question now. Floyd should've wiped him out a long time ago when the prospect of that fight was still juicy.