IMHO, if you want a S550 and the best price you wait until "leftover" season. Ppl were getting brand new 2014s in the late Spring/Summer last year for $27k out the door. Not sure if the S550 will go that low but I don't see why not. ESPECIALLY if Ford comes out and says they are planning on a new engine for the 16 or 17 MY, watch the Coyote S550s just tank in demand/price and its still going to be a ridiculously fast car.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.