Update: I went to the dealer yesterday and am in the process of trying to negotiate for either a better price or better interest rate.
And yes money is a big factor, I am trying to get rid of the A5 because of the high payments and high maintenance costs (freakin $120 for an oil change :0), I have come to the conclusion that getting a 2015 will not lower my payments and may in fact increase it.
If everything goes as planned then i may be the owner of a mustang by tomorrow, I will keep you guys updated.
You will love the 2014, its such an awesome car. The 2015 is awesome too, its one of those things where either option is a really good one.