Keep your current s197 5.0.
I'd understand trading in for the 2016 Camaro SS with the LT1, Brembos, and -200lbs, but not the 200lb heavier s550..
This is pretty much how I see it.
If Ford would have done what the 2016 SS did, then sure I could see more of a reason for people to upgrade from the old model to the new. But with the current hp numbers, weight, and price tag, kind of hard to justify trading in your few year old model.