Your OTD price is about right, but the dealer might be able to take a few hundred off. Remember the dealer still makes the hold-back money from ford...you don't see that in the deal, but it is real money to the dealer. The last time I checked, the hold-back on the ST was about 5%.
My son lives in Northern CA and bought a new 2015 FiST equipped exactly like yours and paid about $500 less.