Well for a 16 team dynasty league your team is pretty solid. I do agree with Benson having a good year with it being a contract year for him, but I think with all of your picks you have a real chance to keep your team young with 3 of the first 14 picks. I can see why he wouldn't want to trade a starting rb who is the main man for his team for a unproven rookie. I would keep your picks, hope for a decent rb at your # 3 pick and then possibly look at the 8-9 range, if someone slides and package your 11 and 14 picks to move up. If not I think that you have enough wr depth to make a move if you needed to also. Good luck.
I would deal the 1.03 rookie pick in a heartbeat for Benson. Gotta figure Benson is good for the next 3 years at least. Plus, the Bengals are now a run-first team. The 1.03 rookie pick (if you look at RB's) will probably be one of C.J. Spiller, Jahvid Best or Jonathan Dwyer. It's way too early to figure where these RB's go -- but it looks as though Seattle, Houston and San Diego are the favorites to draft a first-round RB.
I'm thinking the Seahawks might be the worst of the three teams to have a RB for (and maybe a RBBC with Julius Jones-Justin Forsett) -- so at 1.03 you're looking at the Seahawks' RB. I'd much rather have Benson based on that.