I think we need to do everything in our power to grab Asomugha. I'd offer the Raiders either:
This year's 2nd and 5th....they are cash strapped and there's no way they can afford to sign two top 10 picks.
OR....
Next year's first and this year's fifth.
We definitely have the money to sign him this year...AND...provide atleast two of next year's potential FAs (Smith, Evans, Colston, Vilma) a contract this year. The money we have left is for FAs. I believe that money left over already accounts for the money required to sign our draft picks this year. He would probably get a deal of the same caliber as Samuel, which really is cap friendly for the next two years...which I wouldn't mind one bit.
We'd have McKenzie, Young, David, Gay, Craft, and Asomugha on the roster. This would give us an excellent secondary no matter how McKenzie's health is. I think the FO will take a hard look at his health and that will ultimately be the determining factor if we decide to go after him. Also, if we did snag him....I'd look for us to cut Duece after June 1st to spread the cap hit and also look for us to snag Rivers at 10 if Dorsey/Ellis are gone. Or even Gholston if he's there and let Smith walk next year.