Find out what your car is worth on kbb.com and nada.com.
If they're offering you significantly more than book value, and you still want to stick with a Ford product, and you think you'd be happy with an ST, and you can afford the jump in payments, I'd probably take the offer.
I want an ST, but my car's only worth 12-12,500 on trade. 1 year old, 16k miles, and it's dropped 8k in value. So, I'm stuck.
Joined the dark side.