In my opinion, you have to go LT #2 and Addai #3. Yeah, if AP falls to you at 3, go for it, but if that happens, your Eagles friend is... well... yeah...
How long has the league been going on and how confident are you that you and the rest of the managers will still be into into 3-5+ years from now? If it is a sure thing to last a long time, then MAYBE LT over Peterson, but only then. I am the biggest AP fan on this board, but even I think it's foolish to pass on the short term results that LT has proven to provide.
Either way, you've got the right mind set by going RB-RB. I'd even recommend grabbing MJD with your 20-21 turnaround if he's there, or some other top back. RB is so thin right now and everyone is going to the tandem backfield... MJD will be a horse once Fragile Fred Taylor really drops off soon. Grad Mojo and Colston (or whichever top receiver is around) and then take another receiver (Boldin, Welker, Marshall should be around assuming you have the 40-41 picks) and maybe Palmer or even a third receiver. Guys like Hasselbeck and Cutler should be around for your 60-61 spot (although Cutler could be high on some boards because of the keeper option).
Either way, you've got a great opportunity to dominate with those two early picks.