I'm going to go with Spikes, Peters and Mario Williams. It was very tough to leave off Lee Evans, Moulds, Clements, Lynch, but with the current roster I think I would bolster the D-end position to create a dominant pair with Miller or trio with Miller and Rousseau. Have an stud 4 down LB that can play the run, pass and rush the passer, and then Peters to anchor, dominate and protect Allen.
I could easily be convinced to swap out a Moulds or Evans (whom I think would be unbelievable with Allen's arm) for the ones I picked, or even Clements and Lynch.