Depends on who you have already. If your RB1 is one of the big 3 or 4 (Rice/McCoy/Foster/MJD) I'd say go for Richardson simply because of the future upside. Of course, he may continue to get hurt all the time and be a huge wash-out. If your RB1 is another one of the many ?s this year, maybe hedge your bets by getting 2 (I have, on one team, Jamaal Charles and DMac for instance. I figure one of them will be a #1 even if the other stays gimpy) Peterson is probably gonna be seriously limited the first several weeks at least, but will probably be quality by the end of the season, but I'd be comfortable pairing him with say CJ0K, Jamaal, DMac, Murray or someone like that and hope at least one of them is a stud. AP is more of a short-term solution for this years playoffs IMO, Richardson is more of a long-term gamble with a larger potential pay-off for the next several years. Hope that helps, good luck!