You are not getting a good deal. I bought a 2011 diesel late in 2011 after the 2012 trucks were starting to arrive. I paid less than $42,000 with the diesel engine which with its special transmission adds $9,000 to the sticker price over that of the truck with a gas engine.
There is a reason why Ford makes most of its profits from the sale of pickups and your deal is an excellent example of why this is the case.
I would never pay more than the dealer invoice for any vehicle and that should be your starting point, not the sticker price.
Build a new 2015 truck online and see what the price shows and it will be less than what the salesperson is asking for the 2014 truck. First mistake you made was in even talking to a salesperson. Always go directly to the sales manager or the fleet manager as they do not work on commission and only want to move units. You avoid a tremendous amount of******and speed up the negotiating process considerably with this approach.
After you get your price then start asking for extras like running boards, tow mirrors, and other items that cost the dealer next to nothing to add into the deal and at this point they are invested and do not want to lose the deal anymore than you do. On my $42K truck I got the dealer to throw in the chrome side steps, GM tool box, bed liner, and tow mirrors. If I had bought those items my cost would have been close to $2,000.